[Federal Register Volume 86, Number 201 (Thursday, October 21, 2021)]
[Rules and Regulations]
[Pages 58474-58523]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-20962]



[[Page 58473]]

Vol. 86

Thursday,

No. 201

October 21, 2021

Part IV





 Department of the Interior





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Fish and Wildlife Service





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50 CFR Part 17





Endangered and Threatened Wildlife and Plants; Designation of Critical 
Habitat for the Narrow-Headed Gartersnake; Final Rule

  Federal Register / Vol. 86, No. 201 / Thursday, October 21, 2021 / 
Rules and Regulations  

[[Page 58474]]


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DEPARTMENT OF THE INTERIOR

Fish and Wildlife Service

50 CFR Part 17

[Docket No. FWS-R2-ES-2020-0011; FF09E21000 FXES1111090FEDR 223]
RIN 1018-BD96


Endangered and Threatened Wildlife and Plants; Designation of 
Critical Habitat for the Narrow-Headed Gartersnake

AGENCY: Fish and Wildlife Service, Interior.

ACTION: Final rule.

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SUMMARY: We, the U.S. Fish and Wildlife Service (Service), designate 
critical habitat for the narrow-headed gartersnake (Thamnophis 
rufipunctatus) under the Endangered Species Act of 1973 (Act), as 
amended. In total, 23,785 acres (9,625 hectares) in Greenlee, Apache, 
Yavapai, Gila, and Coconino Counties, Arizona, and Grant, Hidalgo, and 
Catron Counties, New Mexico, fall within the boundaries of the critical 
habitat designation for the narrow-headed gartersnake. This rule 
extends the Act's protections to the narrow-headed gartersnake's 
designated critical habitat.

DATES: This rule is effective November 22, 2021.

ADDRESSES: This final rule is available on the internet at http://www.regulations.gov. Comments and materials we received, as well as 
supporting documentation we used in preparing this rule, are available 
for public inspection at http://www.regulations.gov at Docket No. FWS-
R2-ES-2020-0011.
    The coordinates or plot points or both from which the maps are 
generated are included in the decision file for this critical habitat 
designation and are available at http://www.regulations.gov at Docket 
No. FWS-R2-ES-2020-0011 or on the Service's website at https://www.fws.gov/southwest/es/arizona/. Additional supporting information 
that we developed for this critical habitat designation will be 
available on the Service's website set out above and at http://www.regulations.gov.

FOR FURTHER INFORMATION CONTACT: Jeff Humphrey, Field Supervisor, U.S. 
Fish and Wildlife Service, Arizona Ecological Services Field Office, 
Fish and Wildlife Office, 9828 North 31st Ave. #C3, Phoenix, AZ 85051-
2517; telephone 602-242-0210. Persons who use a telecommunications 
device for the deaf (TDD) may call the Federal Relay Service at 800-
877-8339.

SUPPLEMENTARY INFORMATION:

Executive Summary

    Why we need to publish a rule. Under the Act, if we determine that 
a species is an endangered or threatened species, we must designate 
critical habitat to the maximum extent prudent and determinable. On 
July 8, 2014, we published a final rule to list the narrow-headed 
gartersnake as a threatened species (79 FR 38678). Designations of 
critical habitat can be completed only by issuing a rule.
    What this document does. This rule designates critical habitat for 
the narrow-headed gartersnake of approximately 23,785 acres (9,625 
hectares) in Greenlee, Apache, Yavapai, Gila, and Coconino Counties, 
Arizona, and Grant, Hidalgo, and Catron Counties, New Mexico.
    The basis for our action. Under section 4(a)(3) of the Act, if we 
determine that any species is an endangered or threatened species, we 
must, to the maximum extent prudent and determinable, designate 
critical habitat. Section 3(5)(A) of the Act defines critical habitat 
as (i) the specific areas within the geographical area occupied by the 
species, at the time it is listed, on which are found those physical or 
biological features (I) essential to the conservation of the species 
and (II) which may require special management considerations or 
protections; and (ii) specific areas outside the geographical area 
occupied by the species at the time it is listed, upon a determination 
by the Secretary that such areas are essential for the conservation of 
the species. The Secretary may exclude an area from critical habitat if 
she determines that the benefits of such exclusion outweigh the 
benefits of specifying such areas as part of critical habitat, unless 
she determines, based on the best scientific data available, that the 
failure to designate such area as critical habitat will result in the 
extinction of the species. Section 4(b)(2) of the Act states that the 
Secretary must make the designation on the basis of the best scientific 
data available and after taking into consideration the economic impact, 
the impact on national security, and any other relevant impacts of 
specifying any particular area as critical habitat.
    The critical habitat we are designating in this rule, consisting of 
eight units comprising approximately 447 stream miles (719 kilometers) 
within a maximum 326-foot (100-meter) lateral extent of the active 
stream channel, in an area of 23,784 acres (9,625 hectares) for the 
narrow-headed gartersnake, constitutes our current best assessment of 
the areas that meet the definition of critical habitat for the species.
    Peer review and public comment. During the proposed rule stage, we 
sought the expert opinions of eight appropriate specialists. We 
received responses from three specialists, which informed our 
determination. Information we received from peer review is incorporated 
into this final rule. We also considered all comments and information 
we received from the public during the comment period.

Previous Federal Actions

    Please refer to the final listing rule (79 FR 38678; July 8, 2014), 
the original proposed critical habitat rule (78 FR 41550; July 10, 
2013), and the revised proposed critical habitat rule (85 FR 23608; 
April 28, 2020) for the narrow-headed gartersnake for a detailed 
description of previous Federal actions concerning this species. Those 
rules included the northern Mexican gartersnake (Thamnophis eques 
megalops), but we designated critical habitat for the northern Mexican 
gartersnake in an earlier, separate final rule (80 FR 22518; April 28, 
2021). This rule designates critical habitat only for the narrow-headed 
gartersnake.

Supporting Documents

    In the revised proposed critical habitat rule (85 FR 23608; April 
28, 2020), we stated that a draft analysis document under the National 
Environmental Policy Act (NEPA; 42 U.S.C. 4321 et seq.) for the 
designation of critical habitat would be completed. We have now 
finalized an environmental assessment with a finding of no significant 
impact under NEPA. The environmental assessment and finding of no 
significant impact are available at http://www.regulations.gov at 
Docket No. FWS-R2-ES-2020-0011 and from the Arizona Ecological Services 
Field Office at https://www.fws.gov/southwest/es/arizona/. See Required 
Determinations, below, for a discussion of our NEPA obligations for 
this designation.
    No changes were made to our economic analysis after considering 
public comment on the draft document. The final updated economic 
analysis document (IEc 2021, entire) is available at http://www.regulations.gov at Docket No. FWS-R2-ES-2020-0011.

Summary of Changes From the Proposed Rule

    We reviewed the comments related to critical habitat for the 
narrow-headed gartersnake (see Summary of Comments and Recommendations, 
below), completed our analysis of areas

[[Page 58475]]

considered for exclusion under section 4(b)(2) of the Act (16 U.S.C. 
1531 et seq.), reviewed our analysis of the physical or biological 
features (PBFs) essential to the long-term conservation of the narrow-
headed gartersnake, and finalized the economic analysis of the 
designation. This final rule incorporates changes from our 2020 revised 
proposed critical habitat rule (85 FR 23608; April 28, 2020) based on 
the comments that we received, and have responded to in this document, 
and considers efforts to conserve the narrow-headed gartersnake.
    As a result, our final designation of critical habitat reflects the 
following changes from the April 28, 2020, revised proposed rule (85 FR 
23608):
    (1) We revised unit areas based on comments we received regarding 
areas that did or did not contain the PBFs essential to the 
conservation of the species. These changes resulted in a net increase 
of 5,081 acres (ac) (2,056 hectares (ha)) of critical habitat. Critical 
habitat units were extended laterally to capture areas needed for 
brumation, a period of dormancy during the winter. All areas added to 
this final critical habitat designation were proposed as critical 
habitat for the narrow-headed gartersnake in the 2013 original proposed 
critical habitat rule (78 FR 41550; July 10, 2013) (see Summary of 
Essential Physical or Biological Features).
    (2) We modified PBFs 1(B), 1(C), 1(D), and 3 for the narrow-headed 
gartersnake as identified below under Physical or Biological Features 
Essential to the Conservation of the Species.
    (3) We excluded approximately 508 ac (206 ha) from portions of 
units for the narrow-headed gartersnake, as identified below in Table 2 
(Areas excluded from critical habitat designation by critical habitat 
unit for the narrow-headed gartersnake).
    (4) We corrected several errors in unit descriptions.

Summary of Comments and Recommendations

    We requested written comments from the public on the original 
proposed critical habitat rule (78 FR 41550; July 10, 2013) and on the 
revised proposed critical habitat rule (85 FR 23608; April 28, 2020) 
for the narrow-headed gartersnake. The comment period for the original 
proposed critical habitat rule opened on July 10 and closed on 
September 9, 2013; the comment period for the revised proposed critical 
habitat rule opened on April 28 and closed on June 29, 2020.
    For the original proposed critical habitat rule (78 FR 41550; July 
10, 2013), we contacted appropriate Federal, State, and Tribal 
governments; local agencies; scientific organizations; and other 
interested parties and invited them to comment on the proposed critical 
habitat designation. For the revised proposed critical habitat rule (85 
FR 23608; April 28, 2020), we again contacted all interested parties, 
including appropriate Federal and State agencies, Tribal governments, 
scientific experts and organizations, and other interested parties, and 
invited them to submit written comments on the revised proposal. In the 
April 28, 2020, revised proposed rule, we stated that any comments we 
received in response to the July 10, 2013, proposed rule need not be 
resubmitted as they would be fully considered in this final rule. 
Newspaper notices inviting general public comments were published 
throughout the range of the proposed critical habitat designation for 
both the original and revised proposed rules.
    During the comment period on the original proposed critical habitat 
rule (78 FR 41550; July 10, 2013), we received approximately 30 written 
comment letters on the proposed critical habitat designation. During 
the comment period on the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we received an additional 40 comment letters on 
the revised proposed critical habitat designation or the draft economic 
analysis (IEc 2019, entire). We also received one additional request 
for exclusion of an area that was not identified in the revised 
proposed rule. We reviewed each exclusion request and whether the 
requester provided information or a reasoned rationale to initiate an 
analysis or support an exclusion (see Policy Regarding Implementation 
of Section 4(b)(2) of the Endangered Species Act (81 FR 7226; February 
11, 2016)). All substantive information provided during both comment 
periods has either been incorporated directly into this final 
determination or is addressed in our responses below.
    We also note that we no longer use primary constituent elements 
(PCEs) to identify areas as critical habitat. We eliminated PCEs due to 
redundancy with the physical or biological features (PBFs). This change 
in terminology is in accordance with a February 11, 2016 (81 FR 7414), 
rule to implement changes to the regulations for designating critical 
habitat. In the revised proposed critical habitat rule (85 FR 23608; 
April 28, 2020), we used the comments we had received and additional 
information to revise: (1) The PBFs that are essential to the 
conservation of the species and which may require special management 
considerations or protection under the Act; (2) the criteria used to 
define the areas occupied at the time of listing for the species; and 
(3) the criteria used to identify critical habitat boundaries. We then 
applied the revised PBFs and identification criteria for the species, 
along with additional information we received regarding where these 
PBFs exist on the landscape to determine the geographic extent of each 
critical habitat unit. We received comments on the original proposed 
critical habitat rule (78 FR 41550; July 10, 2013) that referred to 
PCEs, and our responses to those comments below correlate with the 
respective PBFs from the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020).

Peer Review

    In accordance with our peer review policy published on July 1, 1994 
(59 FR 34270), and our August 22, 2016, memorandum updating and 
clarifying the role of peer review actions under the Act, we solicited 
expert opinion on the original proposed critical habitat rule (78 FR 
41550; July 10, 2013) from eight knowledgeable individuals with 
scientific expertise that includes familiarity with the narrow-headed 
gartersnake and its habitat, biological needs, and threats. We received 
responses from three of the peer reviewers. In 2020, during the public 
comment period for the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we received comments from one of the peer 
reviewers regarding our revised proposed rule. We address these peer 
reviewer comments in this final rule as appropriate.
    This rule designates critical habitat only for the narrow-headed 
gartersnake; therefore, in this rule, we limit our discussion of the 
peer reviewer and public comments we received to those concerning the 
narrow-headed gartersnake. We reviewed all the comments we received 
from the peer reviewers for substantive issues and new information 
regarding the narrow-headed gartersnake and its habitat use and needs. 
The peer reviewers provided additional information, clarifications, and 
suggestions to improve the designation. Our revised proposed critical 
habitat rule (85 FR 23608; April 28, 2020) was developed in part to 
address some of the concerns and information raised by the peer 
reviewers in 2013. The additional details and information we received 
from or that were raised by the peer reviewers have been incorporated 
into this final rule, as appropriate. Substantive comments we

[[Page 58476]]

received from peer reviewers as well as Federal, State, Tribal, and 
local governments, nongovernmental organizations, and the public are 
summarized below.
    Comment 1: One peer reviewer commented that nonnative fishes of the 
Centrarchidae and Ictaluridae families characterized by the term 
``spiny-rayed fishes'' are not the only nonnative fishes that are 
detrimental to native fishes that are the prey for the gartersnake. 
They stated that the red shiner in the Cyprinidae family, nonnative 
mosquitofish in the Poeciliidae family, and nonnative trouts in the 
Salmonidae family all negatively impact native fishes as well. A second 
peer reviewer also commented that brown trout (Salmo trutta) are a 
harmful nonnative and would impact the PBFs related to lack of 
nonnative species in several subunits.
    Our Response: In determining the PBFs for the gartersnake, we 
intended to identify those species of nonnative fish that were both 
considered highly predatory on gartersnakes and also highly competitive 
with gartersnakes in terms of common prey resources. The nonnative fish 
species we view as most harmful to gartersnake populations include bass 
(Micropterus sp.), flathead catfish (Pylodictis sp.), channel catfish 
(Ictalurus sp.), sunfish (Centrarchidae), bullheads (Ameiurus sp.), 
bluegill (Lepomis sp.), crappie (Pomoxis sp.), and brown trout. While 
other species may negatively impact native fishes, we highlighted the 
nonnative fish species that pose the greatest threat to narrow-headed 
gartersnakes.
    Comment 2: One peer reviewer stated that our application of the 
``adverse modification'' standard to fish renovation efforts is flawed 
because we can salvage gartersnakes prior to stream renovations and 
release them after a native fish prey base has been reestablished.
    Our Response: For the public and section 7 practitioners to 
understand the types of actions considered to have potential effects to 
designated critical habitat, we generally identify those types of 
actions that could potentially result in adverse modification of 
designated critical habitat. The actual effects of a proposed action on 
designated critical habitat are dependent on many factors related to 
both the action being proposed and the project area. Conservation 
measures can be evaluated against specific attributes of the proposed 
action at the time of consultation for their suitability and potential 
implementation. We agree that salvaging gartersnakes prior to stream 
renovations and then releasing them after a native fish prey base has 
been reestablished could be a conservation recommendation identified 
during section 7 consultation to address effects of such a proposed 
action that includes fish renovation efforts.
    Comment 3: One peer reviewer stated that no areas should be 
excluded from the critical habitat designation based on existing 
habitat conservation plans because we cannot enforce implementation of 
conservation plans.
    Our Response: Section 4(b)(2) of the Act (16 U.S.C. 1533(b)(2)) 
states that we shall designate and make revisions to critical habitat 
on the basis of the best available scientific data after taking into 
consideration the economic impact, national security impact, and any 
other relevant impact of specifying any particular area as critical 
habitat. The Act provides that we may exclude an area from critical 
habitat if we determine that the benefits of such exclusion outweigh 
the benefits of specifying such area as part of the critical habitat, 
unless we determine, based on the best scientific data available, that 
the failure to designate such area as critical habitat will result in 
the extinction of the species. Under our Policy Regarding 
Implementation of Section 4(b)(2) of the Endangered Species Act (81 FR 
7226; February 11, 2016), when conducting this analysis we consider a 
number of factors including whether there are permitted conservation 
plans covering the species in the area such as habitat conservation 
plans, safe harbor agreements, or candidate conservation agreements 
with assurances, or whether there are non-permitted conservation 
agreements and partnerships that would be encouraged by designation of, 
or exclusion from, critical habitat. Under the policy, we analyze 
habitat conservation plans when weighing whether the benefits of 
exclusion outweigh the benefits of including these areas in the 
critical habitat designation, and our analysis includes looking at 
whether the permittee is properly implementing the plan and is expected 
to continue doing so. We have conducted a weighing analysis to 
determine if the benefits of exclusion outweigh the benefits of 
including these areas, and we have used our discretion to determine if 
the existing habitat conservation plans are sufficient to conserve the 
species (see discussion under Consideration of Impacts under Section 
4(b)(2) of the Act, below).
    Comment 4: One peer reviewer commented that it would be helpful to 
have a rating system for the PBFs about prey bases consisting of native 
fishes and an absence of nonnative fishes, to show a gradient among 
sites.
    Our Response: For recovery implementation purposes, we see value in 
understanding and tracking the status of the PBFs related to prey base 
and absence of nonnative aquatic predators, such as nonnative fishes. 
However, in terms of species composition or relative abundance, we do 
not currently have information on what the threshold of each nonnative 
aquatic predator, or combination of such predators, is to be considered 
detrimental to the narrow-headed gartersnake. These thresholds would 
also vary depending on the condition of other PBFs, including organic 
and inorganic structural features in a stream.
    Comment 5: One peer reviewer commented on several PBFs that are 
incorrectly applied to several subunits for the narrow-headed 
gartersnake, including PBF 3 in the Campbell Blue Subunit, West Fork 
Gila River Subunit, the lower 2 miles of Iron Creek Subunit, and Little 
Creek Subunit, and PBF 4 in the lower 2 miles of Iron Creek Subunit, 
Little Creek Subunit, and South Fork Negrito Creek.
    Our Response: While we did not include descriptions of PBFs for 
each subunit in this document, we used the information provided by the 
peer reviewer in our reevaluation of occupancy in the revised proposed 
critical habitat rule (85 FR 23608; April 28, 2020).
    Comment 6: One peer reviewer commented that Willow Creek should be 
a subunit for the narrow-headed gartersnake because there is a museum 
record from 1989 or 1990 and there are adequate PBFs. Because the site 
was formerly suitable, it is likely to become recolonized.
    Our Response: In the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we reviewed gartersnake occupancy to determine 
that a stream or stream reach was occupied by the narrow-headed 
gartersnake at the time of listing if it is within the historical range 
of the species, contains all PBFs for the species (although the PBFs 
concerning prey availability and presence of nonnative, aquatic 
predators are often in degraded condition), and has a last known record 
of occupancy between 1998 and 2019 (see Occupancy Records, 85 FR 23608, 
p. 23617-23619) (see Criteria Used To Identify Critical Habitat). 
Willow Creek does not have a record for the narrow-headed gartersnake 
that meets this occupancy definition, so it is not included in this 
final critical habitat designation for the species.

[[Page 58477]]

    Comment 7: One peer reviewer commented that we should add the 
mainstem of the Negrito reach from the confluence of the north and 
south fork Negrito Creeks to its confluence with the Tularosa River 
reach.
    Our Response: In the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we reviewed gartersnake occupancy to determine 
that a stream or stream reach was occupied by the narrow-headed 
gartersnake at the time of listing if it is within the historical range 
of the species, contains all PBFs for the species (although the PBFs 
concerning prey availability and presence of nonnative, aquatic 
predators are often in degraded condition), and has a last known record 
of occupancy between 1998 and 2019 (see Occupancy Records, 85 FR 23608, 
p. 23617-23619) (see Criteria Used To Identify Critical Habitat). The 
mainstem of Negrito Creek meets this definition for the narrow-headed 
gartersnake and is included in this final critical habitat designation 
for the species.

Federal Agency Comments

    Comment 8: The U.S. Forest Service (USFS) commented that the term 
``spatially intermittent flow'' used in PCE 1 of the original proposed 
critical habitat rule (78 FR 41550; July 10, 2013) is ambiguous because 
spacing between sections of flowing water can vary greatly and may not 
meet the biological needs of the gartersnake or its prey base.
    Our Response: In the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020) and this rule, we define perennial, 
intermittent, and ephemeral as related to stream flow included in PBF 1 
for the narrow-headed gartersnake and clarify the spectrum of stream 
flow regimes that provide stream habitat for the species based on 
scientifically accepted stream flow definitions (Levick et al. 2008, p. 
6; Stromberg et al. 2009, p. 330) (see ``Stream Flow'' in 85 FR 23608, 
April 28, 2020, p. 23613; see also Physical or Biological Features 
Essential to the Conservation of the Species, below).
    Comment 9: USFS requested clarification of what level of water 
pollutants are ``low enough not to affect recruitment'' for PBF 1(C) 
for narrow-headed gartersnake in the revised proposed critical habitat 
rule (85 FR 23608; April 28, 2020).
    Our Response: We do not have specific data related to water 
pollutants that are ``at levels low enough such that recruitment of 
narrow-headed gartersnakes is not inhibited'' (85 FR 23608, April 28, 
2020, p. 23648). Therefore, in this rule, we have amended this PBF to 
read as follows: ``Water quality that meets or exceeds applicable State 
surface water quality standards'' (see Physical or Biological Features 
Essential to the Conservation of the Species, below). Although water 
quality is not identified as a threat to the narrow-headed gartersnake, 
it is a threat to its prey base. Water quality that is absent of 
pollutants or has low levels of pollutants is needed to support the 
fish prey base for the narrow-headed gartersnake. State water quality 
standards identify levels of pollutants required to maintain 
communities of organisms that have a taxa richness, species 
composition, and functional organization that includes the fish prey 
base of the narrow-headed gartersnake.
    Comment 10: In response to the original proposed critical habitat 
rule (78 FR 41550; July 10, 2013), a Federal agency stated that we 
should make it clear that when the 600-foot (ft) (182-meter (m)) width 
of critical habitat falls outside the stream channel, such as when 
channels are constricted by narrow canyon walls, critical habitat does 
not include upland areas that would not be used by the narrow-headed 
gartersnake.
    Our Response: In the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020) for the narrow-headed gartersnake, we defined 
the lateral extent of critical habitat to include terrestrial features 
within 89 ft (27 m) of the active channel of a stream that provide 
thermoregulation, shelter sites, and protection from predators. This 
lateral extent includes some portions of narrow canyon walls and limits 
upland areas beyond narrow canyon walls. This lateral distance was 
based on the greatest average distance narrow-headed gartersnakes moved 
from the water during the wet season at two different sites on the 
Tularosa River in New Mexico over a 3-year study with a sample size of 
69 individuals (Jennings and Christman 2012, p. 12) (see ``Terrestrial 
Space Along Streams,'' 85 FR 23608, April 28, 2020, pp. 23614-23616).
    Subsequently, we received two comments on the revised proposed 
critical habitat rule (85 FR 23608; April 28, 2020) that a distance of 
89 ft (27 m) did not capture known brumation sites on canyon walls used 
by narrow-headed gartersnakes in Oak Creek Canyon in Arizona (see 
Comment 43, below). As explained in our response to comment 43 below, 
we increased the lateral extent of critical habitat up to 328 ft (100 
m) in areas with steep canyon walls to more accurately capture areas 
used by the narrow-headed gartersnake for brumation. This lateral 
extent also limits upland areas beyond narrow canyon walls, and we 
conclude that the changes that we made in this rule address all 
comments on this issue.
    Comment 11: In response to the original proposed critical habitat 
rule (78 FR 41550; July 10, 2013), USFS commented that the gartersnake 
has strong fidelity for brumation or natal sites.
    Our Response: Although we have information that the narrow-headed 
gartersnake uses brumation sites, we are not aware of any literature 
supporting a conclusion that the species has strong fidelity for these 
brumation sites. In this designation, we include some areas that 
capture the PBFs of brumation sites that have been documented in 
telemetry studies conducted that are described in the revised proposed 
critical habitat rule (85 FR 23608, April 28, 2020--see ``Terrestrial 
Space Along Streams'' on pp. 85 FR 23614-23616).
    Comment 12: In response to the original proposed critical habitat 
rule (78 FR 41550; July 10, 2013), several Federal entities commented 
that various areas in the proposal do not currently contain the PBFs 
for narrow-headed gartersnakes. USFS further stated that it would be 
more realistic if we limited critical habitat to the areas that had the 
PBFs, if the PBFs are clearly defined and determinable.
    Our Response: For the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we reevaluated all streams to determine which 
stream reaches contain PBFs. The revised proposed critical habitat rule 
and this rule do not include stream reaches where we determined that 
water flow became completely ephemeral along an otherwise perennial or 
spatially intermittent stream, hydrologic processes needed to maintain 
streams could not be recovered, nonnative aquatic predators outnumbered 
native prey species, or streams were outside the elevation range for 
the narrow-headed gartersnake. The revised proposed critical habitat 
rule (85 FR 23608; April 28, 2020) and this rule include areas that 
were occupied at the time of listing and contain at least one of the 
PBFs. We acknowledge that in some locations, the PBFs concerning prey 
availability and presence of nonnative aquatic predators are often in 
degraded condition and may require special management (see Changes to 
Criteria Used to Identify Critical Habitat in 85 FR 23608, April 28, 
2020, pp. 85 FR 23617-23623; and see Regulation Promulgation, below).
    Comment 13: In response to the original proposed critical habitat 
rule (78 FR 41550; July 10, 2013), several Federal agencies provided 
lists of

[[Page 58478]]

specific areas included in proposed critical habitat that do not have 
stream flow requirements defined in PBF 1(A) to support the narrow-
headed gartersnake or its corresponding prey species identified in PBF 
3. These agencies identified reaches that lacked PBF 1(A) in some areas 
along the following streams included in the 2013 proposed critical 
habitat rule for the narrow-headed gartersnake: Diamond Creek, Little 
Creek, and Turkey Creek in the Upper Gila River Subbasin; Eagle Creek 
in the Middle Gila River Subbasin; Dry Blue Creek, San Francisco River, 
and South Fork Negrito Creek in the San Francisco River Subbasin; and 
Canyon Creek and Carrizo Creek in the Upper Salt River Subbasin. These 
areas included stream reaches where water flow became completely 
ephemeral along an otherwise perennial or spatially intermittent 
stream, and many included the origin of streams, some of which were 
outside of the known elevation range of the species.
    Our Response: In the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we did not include stream reaches where water 
flow becomes completely ephemeral along an otherwise perennial or 
spatially intermittent stream, and we incorporated related information 
received from USFS and others regarding stream flow. We incorporated 
stream flow information received from USFS for Diamond Creek and Gilita 
Creek in the Upper Gila River Subbasin Unit for narrow-headed 
gartersnake. Based on information from USFS and others related to lack 
of stream flow along Diamond Creek and Gilita Creek, designated 
critical habitat for the narrow-headed gartersnake along Diamond Creek 
ends 0.26 miles (mi) (0.4 kilometers (km)) upstream from Star Canyon, 
and critical habitat along Gilita Creek ends upstream of Willow Creek. 
The rule set that we applied in the 2020 revised proposed rule limited 
critical habitat to the known elevation range of the species and 
limited stream length by dispersal distance from confirmed gartersnake 
locations dated 1998 or later. When applied, these two factors of the 
rule set removed all other areas that the commenting Federal agencies 
identified as not having stream flow requirements for the narrow-headed 
gartersnake.
    Comment 14: In response to the original proposed critical habitat 
rule (78 FR 41550; July 10, 2013), USFS stated that narrow-headed 
gartersnake critical habitat in high montane meadows and stream origins 
in ponderosa pine and mixed conifer forests does not have potential to 
develop shoreline habitat as it is defined in PBF 1(C): Shoreline 
habitat with adequate structural complexity and appropriate amounts of 
shrub- and sapling-sized plants.
    Our Response: The PBFs in the revised proposed critical habitat 
rule (85 FR 23608; April 28, 2020) and this rule do not include the 
term ``shoreline habitat'' or the components that were included in 
shoreline habitat in the 2013 proposed rule. Instead, PBFs 1(B) and 
1(D) focus on components that are found throughout all habitat types 
used by the narrow-headed gartersnake, including organic and natural 
inorganic structural features important to the narrow-headed 
gartersnake that fall within the stream channel and within terrestrial 
habitat that is up to 328 ft (100 m) from the active stream channel.
    Comment 15: USFS stated that many areas included in critical 
habitat in the original proposed critical habitat rule (78 FR 41550; 
July 10, 2013) do not have PBF 4: An absence of nonnative fish species 
of the families Centrarchidae and Ictaluridae, bullfrogs, and/or 
crayfish. USFS also stated that much of proposed critical habitat may 
not have the capacity to ever become recolonized by the narrow-headed 
gartersnake due to the current and likely future conditions of these 
nonnative invasive species. In response to the revised proposed 
critical habitat rule (85 FR 23608; April 28, 2020), USFS further 
commented that it will be difficult if not impossible for USFS to 
attain this PBF on its lands that it manages because nonnative species 
are managed by the State and not by USFS.
    Our Response: The revised proposed critical habitat rule (85 FR 
23608; April 28, 2020) and this final rule include areas that were 
occupied at the time of listing, but areas that contain nonnative 
aquatic predators are often in degraded condition and require special 
management. While recognizing USFS concerns, these areas have the 
capacity to be managed to improve the condition of the PBFs for the 
narrow-headed gartersnake through cooperative efforts between State 
wildlife agencies and USFS, and these types of efforts have already 
successfully been undertaken by USFS and State wildlife agencies within 
the range of the narrow-headed gartersnake.
    Comment 16: In response to the revised proposed critical habitat 
rule (85 FR 23608; April 28, 2020), USFS stated that we did not provide 
much explanation for what might constitute special management 
considerations that may be needed in critical habitat, so it is not 
clear what types of management are likely to result in improved PBFs. 
USFS commented that there should be some recognition of the potential 
value of restorative actions that often have short-term adverse effects 
but are designed to result in beneficial effects (e.g., channel 
restoration, prescribed fire, riparian vegetation improvements, etc.).
    Our Response: In the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we stated that we were not changing any of the 
special management considerations from the 2013 original proposed 
critical habitat rule for the narrow-headed gartersnake (see Special 
Management Considerations or Protection in 85 FR 23608, April 28, 2020, 
p. 23624). However, the 2013 original proposed critical habitat rule 
did not include recognition of the potential value of restorative 
actions that often have short-term adverse effects but are designed to 
result in beneficial effects (see Special Management Considerations or 
Protection in 78 FR 41550, July 10, 2013, pp. 41555-41556). To address 
this comment and the information lacking in the 2013 original proposed 
critical habitat rule, we have added this information to the discussion 
of special management considerations in this final rule.
    Comment 17: In response to the original proposed critical habitat 
rule (78 FR 41550; July 10, 2013), USFS stated that proposed critical 
habitat for the narrow-headed gartersnake included areas outside of the 
known elevation range and areas that do not have records of the 
species, including portions of Diamond Creek, Gilita Creek, and Iron 
Creek in the Upper Gila River Subbasin.
    Our Response: In the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we included the elevation range of narrow-
headed gartersnake as a PBF essential to the conservation of the 
species and did not include areas in the proposed critical habitat 
designation outside of this elevation range.
    Comment 18: In response to the revised proposed critical habitat 
rule (85 FR 23608; April 28, 2020), USFS stated that East Fork Black 
River, Bear Wallow Creek, and Fish Creek were not considered occupied 
by narrow-headed gartersnake in the original proposed critical habitat 
rule (78 FR 41550; July 10, 2013), and that we did not provide 
information to support these additions in the 2020 revised proposed 
critical habitat rule. USFS questioned the validity of the Arizona Game 
and Fish Department (AGFD) record for narrow-headed gartersnake in Fish 
Creek and further stated that Fish Creek was

[[Page 58479]]

heavily impacted by the 2011 Wallow Fire. USFS recommended removing 
East Fork Black River, Bear Wallow Creek, and Fish Creek from the final 
designation.
    Our Response: In the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we reviewed gartersnake occupancy to determine 
that a stream or stream reach was occupied at the time of listing for 
the narrow-headed gartersnake if it is within the historical range of 
the species, contains PBFs for the species (although the PBFs 
concerning prey availability and presence of nonnative aquatic 
predators are often in degraded condition), and has a last known record 
of occupancy between 1998 and 2019 (see Occupancy Records, 85 FR 23608, 
p. 23617-23619) (see Criteria Used To Identify Critical Habitat). 
During this review, we became aware of additional records for areas we 
did not include in the 2013 proposed rule, and so we included them in 
our occupancy determination. While we did not discuss individual 
gartersnake records that contribute to occupancy in the 2013 proposed 
rule or the 2020 revised proposed rule, we have these records in our 
files. AGFD provided and verified records of narrow-headed gartersnakes 
in the East Fork Black River, Bear Wallow Creek, and Fish Creek 
(Arizona Game and Fish Department 2013, entire; Ryan 2020, pers. 
comm.). While the 2011 Wallow Fire significantly reduced native fish 
abundance in Fish Creek, native fish have since recolonized the stream 
(Nowak et al. 2017, Table 3). For these reasons, we included these 
areas in this final designation.
    Comment 19: In response to the original proposed critical habitat 
rule (78 FR 41550; July 10, 2013), USFS stated that proposed critical 
habitat will affect numerous livestock grazing allotments on the Tonto 
National Forest. In addition, another Federal agency stated concerns 
about current and potential future management of public lands within 
proposed designated critical habitat areas, including grazing and off-
highway vehicle (OHV) use. There is a grazing permit renewal under 
review that would allow for grazing October through January within the 
Palmerita Ranch allotment on riparian and upland areas. The agency also 
stated that there is a special recreational permit issued for an annual 
3-day OHV poker run event, which would occur partially on navigable 
washes on Federal lands.
    Our Response: With respect to livestock grazing and OHV use in 
areas of critical habitat, Federal agencies that authorize, carry out, 
or fund actions that may affect listed species or designated critical 
habitat are required to consult with us to ensure the action is not 
likely to jeopardize listed species or destroy or adversely modify 
designated critical habitat. This consultation requirement under 
section 7 of the Act is not a prohibition of Federal agency actions; 
rather, it is a means by which they may ensure that their actions 
proceed in a manner that avoids jeopardy or adverse modification. Even 
in areas absent designated critical habitat, if the Federal agency 
action may affect a listed species, consultation is still required to 
ensure the action is not likely to jeopardize the species. Because the 
areas designated as critical habitat are occupied and consultation will 
be required to meet the jeopardy standard, the impact of the critical 
habitat designation should be minimal and administrative in nature.
    Comment 20: In response to the revised proposed critical habitat 
rule (85 FR 23608; April 28, 2020), USFS stated that maintenance of 
adequate base flow in Eagle Creek is impacted by State water law and 
rights and outside of the purview of USFS. USFS expressed concern that 
Federal agencies may be impacted by the Act's section 7 reasonable and 
prudent measures that are not implementable.
    Our Response: We understand that maintenance of adequate base flow 
in streams is impacted by State water law and rights that are outside 
of the purview of USFS. Under section 7 of the Act when evaluating the 
effects on critical habitat, we consider impacts on base flow from 
ongoing State water management operations within the designated units 
that are not within the agencies' discretion to modify to be part of 
the baseline of an effects analysis. Service policy states that section 
7 consultation should result in reasonable and prudent measures that 
minimize the impacts of incidental take to the extent reasonable and 
prudent. They should be developed in coordination with the action 
agency and applicant, in any, to ensure that the measures are 
reasonable, that they cause only minor changes to the project, and that 
they are within the legal authority and jurisdiction of the agency or 
applicant to carry out. Therefore, they must be implementable.
    Comment 21: In response to the original proposed critical habitat 
rule (78 FR 41550; July 10, 2013), USFS requested we define disturbance 
thresholds for actions ``that would significantly increase sediment 
deposition or scouring within the stream channel'' such as vegetation 
treatments, prescribed fire, and wildfire suppression. USFS also 
requested we include language addressing the scope, scale, and duration 
of actions ``that would alter water chemistry beyond the tolerance 
limits of a gartersnake prey base'' and actions ``that would remove, 
diminish, or significantly alter the structural complexity of key 
natural structural habitat features in and adjacent to critical 
habitat.'' USFS stated that these actions are extremely broad in scope 
and do not differentiate short-term impacts from true long-term, more 
permanent impacts that could result in adverse modification.
    Our Response: The purpose of the designation of critical habitat to 
identify those areas critical to the conservation of the species. For 
the public and section 7 practitioners to understand the types of 
actions considered to have potential effects on designated critical 
habitat, we generally identify those types of actions that could 
potentially result in adverse modification of designated critical 
habitat. The actual effects of a proposed action on designated critical 
habitat are dependent on many factors related to both the action being 
proposed and the project area. Therefore, we cannot determine and 
include thresholds for adverse modification in this rule. The 
appropriate process for that determination is the Act's section 7 
process, during which specific factors within the proposed action and 
conditions within the project area can be evaluated.
    Comment 22: In response to the revised proposed critical habitat 
rule (85 FR 23608; April 28, 2020), USFS commented that ``[a]ctions and 
structures that would physically block movement of gartersnakes and 
their prey species'' should not include a discussion of predatory 
species, because the presence of nonnative aquatic predatory species in 
a waterbody reduces population viability, which is considered under 
actions included in those ``that would directly or indirectly result in 
the introduction, spread, or augmentation of predatory nonnative 
species in gartersnake habitat.''
    Our Response: Including this language with regard to nonnative 
aquatic predatory species within the description of actions and 
structures that would block the movements of gartersnakes and their 
prey species, as well as within the description of actions that would 
result in the introduction, spread, and augmentation of predatory 
nonnative species, is important to clarify two different types of 
effects that result from similar actions. The presence of such 
nonnative aquatic predatory species can both act as a barrier to 
movement and reduce habitat

[[Page 58480]]

quality due to presence of nonnative aquatic predatory species.
    Comment 23: In response to both the original proposed critical 
habitat rule (78 FR 41550; July 10, 2013) and the revised proposed 
critical habitat rule (85 FR 23608; April 28, 2020), USFS and others 
stated that we need to provide a reasonable, rational, and non-
arbitrary timeframe for restocking of streams treated with piscicides, 
as the application of a standard that would determine adverse 
modification if the prey base was affected as described for 7 or more 
days would in many cases preclude the application of piscicides to 
restore listed or at-risk aquatic species, forsaking their recovery for 
gartersnakes.
    Our Response: The purpose of the designation of critical habitat is 
not to evaluate every potential project or action that could adversely 
affect or modify designated critical habitat, but rather to identify 
those areas critical to the conservation of the narrow-headed 
gartersnake. For the public and section 7 practitioners to understand 
the types of actions considered to have potential effects to designated 
critical habitat, we generally identify those types of actions that 
could potentially result in adverse modification of designated critical 
habitat. The actual effects of a proposed action of designated critical 
habitat are dependent on many factors related to both the action being 
proposed and the project area. Therefore, we cannot determine and 
include overall thresholds for adverse modification in this rule. The 
appropriate process for that determination is during the Act's section 
7 process, during which specific factors within the proposed action and 
conditions within the project area can be evaluated.
    Comment 24: The U.S. Small Business Administration and other 
commenters stated that we should consider the full scope of economic 
impacts to small entities and conduct a thorough Regulatory Flexibility 
Act analysis for critical habitat rules.
    Our Response: Under the Regulatory Flexibility Act (RFA; 5 U.S.C. 
601 et seq.), as amended by the Small Business Regulatory Enforcement 
Fairness Act of 1996 (SBREFA; 5 U.S.C. 801 et seq.), Federal agencies 
are required to evaluate the potential incremental impacts of a 
rulemaking only on directly regulated entities. The regulatory 
mechanism through which critical habitat protections are realized is 
section 7 of the Act, which requires Federal agencies, in consultation 
with the Service, to ensure that any action authorized, funded, or 
carried out by the agency is not likely to adversely modify critical 
habitat. Therefore, only Federal action agencies are directly subject 
to the specific regulatory requirement (avoiding destruction and 
adverse modification) imposed by critical habitat designation. Under 
these circumstances, it is our position that only Federal action 
agencies will be directly regulated by this designation. Therefore, 
because Federal agencies are not small entities, we can certify that 
this rule will not have a significant economic impact on a substantial 
number of small entities (see Required Determinations, below). Thus, no 
regulatory flexibility analysis is required.
    Comment 25: The U.S. Small Business Administration commented that 
we should continue to engage with stakeholders early in the process and 
consider public comments.
    Our Response: Stakeholder engagement is important to balancing the 
long-term conservation of sensitive species and their habitats with the 
interests of stakeholders and the needs of the public. For our original 
proposed critical habitat rule (78 FR 41550; July 10, 2013) and revised 
proposed critical habitat rule (85 FR 23608; April 28, 2020), we 
conducted outreach to relevant Federal, State, and local municipalities 
and stakeholders, and published public news releases to alert the 
public to the proposals and request public comments. Specifically, in 
the proposed rules, we solicited information from the public regarding 
potential exclusions of areas based on management plans or other 
conservation efforts including partnerships, as well as other 
information related to the species and potential impacts of designating 
critical habitat. This final rule outlines our consideration of public 
comments we received on both the original and revised proposed rules.

State Comments

    Comment 26: Arizona Game and Fish Department (AGFD) commented that 
while they recognize the intent of our use of the term ``predatory 
sportfish,'' it is important to point out that all sportfish are 
predatory, as are all of our native fishes (i.e., they all prey on 
other organisms) and all interactions with sportfish are not negative. 
Further, not all sportfish or native species eat snakes.
    Our Response: In the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we used the term ``predatory sportfish'' to 
explain how we delineated critical habitat: We identified and removed 
stream reaches where stocking or management of predatory sportfish is a 
priority and is conducted on a regular basis. In this rule, we have 
removed the term ``predatory sportfish'' and replaced it with 
``nonnative fish species of the families Centrarchidae and 
Ictaluridae,'' so that it is consistent with the description of species 
used in the PBF related to nonnative aquatic predators.
    Comment 27: In response to our original proposed critical habitat 
rule (78 FR 41550; July 10, 2013), New Mexico Department of Game and 
Fish (NMDGF) commented that the narrow-headed gartersnake is known both 
historically and recently from all three of its properties within or 
adjacent to the Upper Gila River Subbasin Unit. These properties 
include the Red Rock Wildlife Management Area, which is a public 
fishing and recreation area; the Bill Evans Fishing Area, which is a 
public fishing site; and the Heart Bar Wildlife Area, which is a public 
fishing and recreation area. NMDGF also noted that the proposal 
includes its Glenwood State Fish Hatchery within the narrow-headed 
gartersnake San Francisco River Subbasin Unit.
    Our Response: In the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we reviewed narrow-headed gartersnake occupancy 
to determine that a stream or stream reach was occupied at the time of 
listing for the narrow-headed gartersnake if it is within the 
historical range of the species, contains PBFs for the species 
(although the PBFs concerning prey availability and presence of 
nonnative aquatic predators are often in degraded condition), and has a 
last known record of occupancy between 1998 and 2019 (see Occupancy 
Records, 85 FR 23608, p. 23617-23619) (see Criteria Used To Identify 
Critical Habitat). As a result of our review of occupancy and 
implementation of our rule set for stream length, we have added Red 
Rock Wildlife Management Area, Bill Evans Fish Area, and Heart Bar 
Wildlife Area to the description of the Upper Gila River Subbasin Unit 
in this final critical habitat designation for the narrow-headed 
gartersnake.
    Comment 28: AGFD stated that the revised proposed critical habitat 
rule (85 FR 23608; April 28, 2020) is adequate for recovery of the 
narrow-headed gartersnake and that there are some areas that were 
occupied historically but from which the species has been extirpated. 
AGFD will continue the recovery efforts of reintroducing narrow-headed 
gartersnakes back into historically occupied habitats to contribute to 
recovery, regardless of their current occupied status or their critical 
habitat designation.
    Our Response: We appreciate the AGFD's partnership in the 
conservation and recovery of the narrow-headed

[[Page 58481]]

gartersnake. We only consider unoccupied areas to be essential where a 
critical habitat designation limited to geographical areas occupied at 
the time of listing by the species would be inadequate to ensure the 
conservation of the species. In addition, for an unoccupied area to be 
considered essential, we must determine that there is a reasonable 
certainty both that the area will contribute to the conservation of the 
species and that the area contains one or more of the PBFs essential to 
the conservation of the species. At this point in time, we do not know 
what areas within the species' historical range will contribute to the 
conservation of the species.
    Comment 29: Both AGFD and NMDGF stated concerns with the 
Application of the ``Adverse Modification'' Standard discussion in the 
revised proposed critical habitat rule (85 FR 23608, April 28, 2020, 
pp. 23633-23634). AGFD pointed out that in the same discussion in the 
original proposed critical habitat rule (78 FR 41550, July 10, 2013, 
pp. 41576-41577), we discuss activities ``that may affect critical 
habitat, when carried out, funded, or authorized by a Federal agency 
[and that] should result in section 7 consultation,'' but in the 2020 
revised proposed critical habitat rule, we discuss the same activities 
but change the ``may affect critical habitat'' to ``are likely to 
destroy or adversely modify critical habitat.'' AGFD recommended that 
in the final rule we use the same language in this discussion that we 
used in the 2013 original proposed critical habitat rule. AGFD also 
expressed concern that the 2020 revised proposed critical habitat rule 
essentially says that the effect has already been determined that any 
of these activities will destroy or adversely modify critical habitat.
    Our Response: The change in wording as it applies to the 
Application of the ``Adverse Modification'' Standard in the 2020 
revised proposed critical habitat rule (85 FR 23608, April 28, 2020) 
was a response to correct an error in phrasing from the original 
proposed critical habitat rule (78 FR 41550, July 10, 2013). In this 
rule's Application of the ``Adverse Modification'' Standard discussion, 
below, we include actions that could cause adverse effects to critical 
habitat, and not necessarily cause adverse modification to critical 
habitat, so that the public and section 7 practitioners can understand 
the types of actions we consider to have potential effects to 
designated critical habitat. The actual effects of a proposed action on 
designated critical habitat are dependent on many factors related to 
both the action being proposed and the project area. Therefore, we 
cannot determine and include thresholds for adverse modification in 
this rule. The appropriate process for that determination is the Act's 
section 7 process, during which specific factors within the proposed 
action and conditions within the project area can be evaluated.
    Comment 30: Both AGFD and NMDGF stated concerns with some 
activities included in the analysis of the ``adverse modification'' 
standard because the activities are valuable to the restoration and 
recovery of native species even if they have temporary impacts to 
critical habitat. AGFD and NMDGF expressed concern about the time 
threshold we included in the Application of the ``Adverse 
Modification'' Standard discussion to determine that actions that would 
deliberately remove, diminish, or significantly alter the native or 
nonnative, soft-rayed fish component of the prey base within occupied 
habitat for a period of 7 days or longer would reach an adverse 
modification determination. AGFD further explained that stream 
renovation projects are needed to ensure that a healthy native fish 
community exists and that gartersnakes will also thrive. Chemical 
renovations can take longer than 7 days for the chemicals to dissipate 
to levels that are safe for native fish, or multiple treatments may 
need to be conducted to be effective. NMDGF requested removing fish 
barriers, water diversion, fish habitat restoration, and chemical 
treatments from the Application of the ``Adverse Modification'' 
Standard discussion in the final rule.
    Our Response: In this rule's Application of the ``Adverse 
Modification'' Standard discussion, below, we acknowledge that some 
conservation actions will have short-term adverse effects but will 
ultimately result in long-term benefits to gartersnake critical 
habitat. The actual effects of a proposed action of designated critical 
habitat are dependent on many factors related to both the action being 
proposed and the project area. The appropriate process for that 
determination is the Act's section 7 process, during which specific 
factors within the proposed action and conditions within the project 
area can be evaluated. We understand that there are no clear data to 
suggest that narrow-headed gartersnakes must feed within 7 days of 
their last meal. As stated above, we also agree that it is not possible 
to determine and include thresholds for adverse modification in this 
rule. Therefore, in this rule, we removed the time threshold that 
commenters interpreted to limit fish removal to a 7-day window.
    Comment 31: NMDGF requested exclusion for the Glenwood State Fish 
Hatchery in the Whitewater Creek Subunit of the San Francisco River 
Subbasin Unit for the narrow-headed gartersnake because there are no 
records of the species within the hatchery boundary and Whitewater 
Creek is not perennial at the hatchery. NMDGF further explains that the 
Service's Memorandum for the Intra-Service Section 7 Endangered Species 
Act Consultation for the Proposed Operation and Maintenance of Hatchery 
Facilities NM F-66 Project concurred with a ``no effect'' determination 
for the narrow-headed gartersnake because the snake is not currently 
present.
    Our Response: In the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we reviewed narrow-headed gartersnake occupancy 
to determine that a stream or stream reach was occupied at the time of 
listing for narrow-headed gartersnake if it is within the historical 
range of the species, contains PBFs for the species (although the PBFs 
concerning prey availability and presence of nonnative aquatic 
predators are often in degraded condition), and has a last known record 
of occupancy between 1998 and 2019 (see Occupancy Records, 85 FR 23608, 
p. 23617-23619) (see Criteria Used To Identify Critical Habitat). The 
segment of Whitewater Creek included in the critical habitat 
designation for the narrow-headed gartersnake meets this definition.
    In the revised proposed critical habitat rule (85 FR 23608; April 
28, 2020) and this rule, we also define perennial, intermittent, and 
ephemeral as related to stream flow included in PBF 1 for the narrow-
headed gartersnake and clarify the spectrum of stream flow regimes that 
provide stream habitat for the species based on scientifically accepted 
stream flow definitions (Levick et al. 2008, p. 6; Stromberg et al. 
2009, p. 330) (see ``Stream Flow'' in 85 FR 23608, April 28, 2020, p. 
23613; see also Physical or Biological Features Essential to the 
Conservation of the Species, below). Although Whitewater Creek is 
ephemeral at the Glenwood State Fish Hatchery, it is perennial upstream 
of the hatchery and downstream at its confluence with the San Francisco 
River, so the entire stream segment meets our definition of critical 
habitat.
    Under section 7 of the Act, Federal agencies are required to 
consult with the Service to ensure that the actions they carry out, 
fund, or authorize are not

[[Page 58482]]

likely to jeopardize the continued existence of the species, or destroy 
or adversely modify critical habitat. For a jeopardy or ``take'' 
analysis, we analyze effects to a species if the species is present in 
the action area during the time of the action. For an adverse 
modification analysis, we analyze effects to critical habitat if 
critical habitat for a species is present in the action area. 
Therefore, defining where a species is occupied at the time of listing 
for critical habitat designation is not synonymous with a determination 
that an area is currently occupied for purposes of a jeopardy analysis 
under section 7 of the Act or a ``take'' analysis under section 10 of 
the Act. Those determinations depend on the best available information 
at the time of the analysis, and the likely effects and likelihood of 
take depend on the action under consideration.
    While the Glenwood State Fish Hatchery along Whitewater Creek meets 
our definition of critical habitat, consideration of possible 
exclusions from critical habitat are in our discretion and generally 
follow our Policy Regarding Implementation of Section 4(b)(2) of the 
Endangered Species Act (81 FR 7226; February 11, 2016). With respect to 
NMDGF's request to exclude the Glenwood State Fish Hatchery along 
Whitewater Creek, we are not excluding the area from this final rule. 
See Consideration of Impacts under Section 4(b)(2) of the Act, Private 
or Other Non-Federal Conservation Plans or Agreements and Partnerships, 
in General, below.
    Comment 32: New Mexico Department of Agriculture (NMDA) expressed 
support for excluding private lands owned by Freeport-McMoRan within 
the U-Bar Ranch property along the Gila River from critical habitat for 
the narrow-headed gartersnake. NMDA stated that voluntary conservation 
planning and actions on the property are adequate for conserving the 
species. Freeport-McMoRan Tyrone Inc. and Pacific Western Land Company 
(collectively known as ``FMC'') also commented that lands owned by FMC 
along the upper Gila River in the Gila/Cliff Valley, Grant County, New 
Mexico, should be excluded from critical habitat pursuant to section 
4(b)(2) of the Act based on their habitat management plans for 
spikedace (Meda fulgida) and loach minnow (Rhinichthys cobitis) and for 
southwestern willow flycatcher (Empidonax traillii extimus). They 
stated that these management plans protect and support habitat for 
aquatic and riparian species, including native prey species for the 
narrow-headed gartersnake.
    Our Response: Consideration of possible exclusions from critical 
habitat are in our discretion and generally follow our Policy Regarding 
Implementation of Section 4(b)(2) of the Endangered Species Act (81 FR 
7226; February 11, 2016). In response to FMC's request to exclude their 
lands along the upper Gila River based on FMC habitat management plans 
for spikedace and loach minnow and for grazing management actions 
benefiting southwestern willow flycatcher, we have determined that the 
exclusion would not be appropriate for several reasons. Although we 
commend FMC for investing time, effort, and funding for conservation on 
the Gila River, the habitat conservation efforts to date that have been 
implemented are focused on management actions for spikedace, loach 
minnow, and southwestern willow flycatcher along the Gila River. There 
are no conservation efforts specific to the narrow-headed gartersnake 
included in these plans. In identifying critical habitat for the 
narrow-headed gartersnake, we identified those areas that meet the 
definition of critical habitat under section 3(5)(A) of the Act. 
Although management actions for one listed species may overlap other 
species' habitat or be mutually beneficial to multiple listed species, 
the PBFs in occupied habitat for the narrow-headed gartersnake differ 
from the PBFs identified for spikedace, loach minnow, and southwestern 
willow flycatcher. As a result, excluding these areas based on 
management for listed fish and bird species does not meet our criteria 
for exclusion. With respect to the Upper Gila River Subbasin Unit for 
the narrow-headed gartersnake, we determined that the benefits of 
exclusion do not outweigh the benefits of inclusion. See Consideration 
of Impacts under Section 4(b)(2) of the Act, Private or Other Non-
Federal Conservation Plans or Agreements and Partnerships, in General, 
below.
    Comment 33: NMDA commented that we should reconsider the value of 
critical habitat if we cannot identify a case in which consultation 
would require additional conservation measures.
    Our Response: We are required by section 4(a)(3) of the Act to 
designate critical habitat for listed species if we find that the 
designation is prudent and determinable, as we did for the narrow-
headed gartersnake, regardless of whether we can foresee project 
modifications that may be required.
    Comment 34: NMDGF requested that we exclude developed, human-made 
fish migration barrier structures from critical habitat because 
including them will hinder conservation efforts for native fish and 
snakes by delaying construction and maintenance efforts of these 
structures.
    Our Response: When determining critical habitat boundaries, we made 
efforts to avoid including developed areas such as lands covered by 
buildings, pavement, and other structures because such lands lack the 
PBFs. The human-made fish barriers are in-water structures that fall 
within the boundaries of habitats used by narrow-headed gartersnakes. 
Because of this and the limitations of map scale, any developed lands, 
such as constructed fish barriers left inside critical habitat 
boundaries, are not considered critical habitat because they lack the 
necessary PBFs. However, a Federal action involving the fish barriers, 
such as maintenance, may trigger section 7 consultation with respect to 
critical habitat or the prohibition of adverse modification if the 
specific action would affect the PBFs in surrounding critical habitat.
    Comment 35: The New Mexico Interstate Stream Commission commented 
that the Service must complete an environmental impact statement (EIS) 
for designating critical habitat.
    Our Response: NEPA dictates that the Service determine the 
appropriate level of NEPA review (40 CFR 1501.3). The Service completed 
an environmental assessment (EA) to determine whether an EIS was 
necessary or if a finding of no significant impact (FONSI) could be 
determined. The Service released a draft EA that was available for 
public comment from December 18, 2020, to January 16, 2021, on the 
Arizona Ecological Services Field Office website; we received five 
comments on the draft EA. After addressing the public comments 
received, the Service finalized the EA and found that designating 
critical habitat for the narrow-headed gartersnake would not result in 
significant impacts to the environment. A copy of the final EA and 
FONSI is available at http://www.regulations.gov at Docket No. FWS-R2-
ES-2020-0011. Therefore, the appropriate NEPA process was completed, 
and an EIS is not required.

Tribal Comments

    In accordance with our requirements to coordinate with Tribes on a 
government-to-government basis, we solicited information from the 
following 17 Tribes regarding the designation of critical habitat for 
the narrow-headed gartersnake: Chemehuevi Indian Tribe, Cocopah Indian 
Tribe, Colorado River

[[Page 58483]]

Indian Tribes, Fort McDowell Yavapai Nation, Fort Mojave Indian Tribe, 
Gila River Indian Community (GRIC), Hopi Tribe, Hualapai Tribe, 
Mescalero Apache Tribe, Pascua Yaqui Tribe, Salt River Pima--Maricopa 
Indian Community, San Carlos Apache Tribe, Tohono O'odham Nation, Tonto 
Apache Tribe, White Mountain Apache Tribe, Yavapai-Apache Nation, and 
Yavapai-Prescott Indian Tribe. While all of these Tribes may have 
interest in lands included in proposed critical habitat for the narrow-
headed gartersnake, the only Tribal land included in the revised 
proposed critical habitat designation (85 FR 23608; April 28, 2020) was 
land owned by the San Carlos Apache Tribe and the White Mountain Apache 
Tribe. We also met with representatives of the GRIC and White Mountain 
Apache Tribe to discuss this proposed designation. The GRIC expressed 
concern regarding potential effects that critical habitat may have on 
water allocation. In communications with the Service, the San Carlos 
Apache Tribe expressed interest in being excluded from the designation, 
and White Mountain Apache Tribe sent a letter requesting to be excluded 
from the designation.
    Comment 36: GRIC expressed concern about how designation of 
critical habitat for the narrow-headed gartersnake on the Gila and San 
Francisco Rivers might cause potential curtailment of water inflow to 
San Carlos Reservoir and subsequent downstream delivery to GRIC 
pursuant to their water rights settlement.
    Our Response: We do not anticipate water inflow to San Carlos 
Reservoir and subsequent downstream delivery of water to GRIC will be 
impacted by this critical habitat designation. The economic analysis 
outlines the substantial baseline protections currently afforded the 
narrow-headed gartersnake throughout the designation, and it includes a 
determination that the impacts of this critical habitat designation 
will be minimal (see Consideration of Impacts under Section 4(b)(2) of 
the Act, Private or Other Non-Federal Conservation Plans Related to 
Permits Under Section 10 of the Act).
    Comment 37: White Mountain Apache Tribe requested that the White 
Mountain Apache Homeland be excluded from the designation of critical 
habitat based on the White Mountain Apache Tribe's management and 
conservation of narrow-headed gartersnake habitat through several 
measures. These measures include formally approving the White Mountain 
Apache Native Fish Management Plan that includes prey species of the 
narrow-headed gartersnake; enacting Resolution 89-149 to designate 
streams and riparian zones as sensitive fish and wildlife areas; 
adopting a Water Quality Protection Ordinance to promote the health of 
Tribal waters and the people, plants, and wildlife that depend on them; 
and implementing overall holistic management of wildlife and natural 
resources within the Tribe's Homeland. White Mountain Apache Tribe also 
stated that the designation would infringe on Tribal sovereignty and 
directly interfere with Tribal self-government recognized as paramount 
in Joint Secretarial Order No. 3206.
    Our Response: We have reviewed the request for exclusion from the 
White Mountain Apache Tribe and excluded all Tribal lands from the 
final designation under section 4(b)(2) of the Act (see Consideration 
of Impacts under Section 4(b)(2) of the Act, below). Because all Tribal 
lands have been excluded from this final critical habitat designation, 
any required conservation activities on Tribal lands would be based 
solely on the presence of the narrow-headed gartersnake on Tribal lands 
due to the listing of the species as a threatened species under the Act 
(see 79 FR 38678; July 8, 2014).

Public Comments

    Comment 38: Several commenters stated that designating critical 
habitat for the narrow-headed gartersnake is not prudent because 
disclosing where individuals can be found would increase illegal taking 
of these species. Several commenters also stated that designating 
critical habitat is not prudent because most of the stream reaches 
included in the proposed designation have already been designated as 
critical habitat for other listed species.
    Our Response: As discussed in the final listing rule (79 FR 38678; 
July 8, 2014), there is no imminent threat of take attributed to 
illegal collection for this species, and identification and mapping of 
critical habitat is not expected to initiate any such threat.
    Additionally, criteria used to determine if designation of critical 
habitat for the narrow-headed gartersnake is prudent pursuant to our 
regulations (50 CFR 424.12(a)(1)) may differ from criteria used to 
designate critical habitat for other listed species. Therefore, because 
none of the circumstances enumerated in our regulations at 50 CFR 
424.12(a)(1) has been met and because there are no other circumstances 
we have identified for which this designation of critical habitat would 
not be prudent, we have determined that the designation of critical 
habitat is prudent for the species.
    In development of the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we used the best scientific and commercial 
information available. In that revised proposed rule, we reassessed 
occupancy at the time of listing by reviewing all records for the 
narrow-headed gartersnake that we used in our original proposed 
critical habitat rule (78 FR 41550; July 10, 2013) in conjunction with 
expected survivorship of the species. We also used subsequent surveys 
in areas that had no detection of the species, and reviewed changes in 
threats that may have prevented occupancy at the time of listing. We 
determined that the best available information reflecting occupancy at 
the time of listing supports a more recent date of records since 1998, 
which includes areas within the United States (see Criteria Used To 
Identify Critical Habitat, below). This and other information represent 
the best scientific and commercial data available and led us to 
determine areas of occupancy at the time of listing. Our review of the 
best scientific and commercial data available supports the conclusion 
that the designation of critical habitat is prudent and determinable 
for the narrow-headed gartersnake.
    Comment 39: Multiple commenters stated that the available data are 
insufficient to identify the species' needs and impacts from wildfires 
in order to determine areas for critical habitat.
    Our Response: In development of the revised proposed critical 
habitat rule (85 FR 23608; April 28, 2020), we used the best scientific 
and commercial information available. We have sufficient information to 
determine the areas essential to the conservation of the species (i.e., 
critical habitat) as documented in the 2020 revised proposed rule. In 
addition to reviewing narrow-headed gartersnake-specific survey 
reports, we also focused on survey reports and heritage data for fish 
and amphibians from State wildlife agencies, as they captured important 
data on the existing community ecology that affects the status of the 
narrow-headed gartersnake. In addition to species data sources, we used 
publicly available geospatial datasets depicting water bodies, stream 
flow, vegetation type, and elevation to identify critical habitat 
areas. We reviewed the available information pertaining to the 
biological needs of the species and habitat characteristics where the 
species is located. This and other information represent the best 
scientific and commercial data available and led us to

[[Page 58484]]

conclude that the designation of critical habitat is determinable for 
the narrow-headed gartersnake.
    As discussed in the final listing rule (79 FR 38678; July 8, 2014), 
landscape-scale wildfires have impacted the species and its habitats. 
We understand that wildfires can cause sedimentation that can reduce 
water quality and prey availability for the narrow-headed gartersnake, 
and we included areas in critical habitat that had records of the 
species from 1998 to 2019, but that may need special management to 
maintain PBFs 1 and 3 as a result of recent or future wildfires.
    Comment 40: Two commenters stated that ephemeral reaches of 
streams, as well as intermittent streams, can provide habitat for 
narrow-headed gartersnakes. Gartersnakes use them on a seasonal basis, 
and they may have lower densities of nonnative aquatic species. 
Therefore, they should be included in the critical habitat designation.
    Our Response: In development of the revised proposed critical 
habitat rule (85 FR 23608; April 28, 2020), we clarified the spectrum 
of stream flow regimes that provide stream habitat for the narrow-
headed gartersnake based on scientifically accepted stream flow 
definitions (Levick et al. 2008, p. 6; Stromberg et al. 2009, p. 330). 
We define a ``spatially intermittent'' stream as a stream that is 
interrupted, perennially interrupted, or spatially intermittent; has 
perennial flow occurring in areas with shallow bedrock or high 
hydraulic connectivity to regional aquifers; and has ephemeral to 
intermittent flow occurring in areas with deeper alluvial basins or 
greater distance from the headwaters (Stromberg et al. 2009, p. 330). 
The spatial patterning of wet and dry reaches on spatially intermittent 
streams changes through time in response to climatic fluctuations and 
to human modifications of the landscape (Stromberg et al. 2009, p. 
331).
    We explain that streams that have perennial or spatially 
intermittent flow can provide stream habitat for the species (Levick et 
al. 2008, p. 6; Stromberg et al. 2009, p. 330) (see ``Stream Flow'' in 
85 FR 23608, April 28, 2020, p. 23613; and Physical or Biological 
Features Essential to the Conservation of the Species, below). While 
streams with intermittent flow reaches do serve as habitat for narrow-
headed gartersnakes and are included in the designation, ephemeral 
streams do not. Within the range of the narrow-headed gartersnake, 
perennial streams become ephemeral as they approach their headwaters. 
Narrow-headed gartersnakes have not been found in these ephemeral 
reaches because fish communities become sparse to nonexistent in these 
areas so that the gartersnake prey base is likely absent. In addition, 
there is no upstream habitat above the headwaters of a stream, so these 
ephemeral reaches do not provide connectivity and are not included in 
critical habitat.
    Comment 41: One commenter stated that we should maintain a 
shoreline component as part of the PBFs that identify critical habitat. 
They stated their view that eliminating the shoreline component could 
result in improperly leaving out habitats that narrow-headed 
gartersnakes use because they span the transition between upland 
riparian and in-stream habitats.
    Our Response: We do not use the term ``shoreline habitat'' in the 
PBFs for the narrow-headed gartersnake because shorelines fluctuate. 
Instead, we are focusing on the substrate. The key to the original 
primary constituent element for ``shoreline habitat'' was the substrate 
itself, not the fluctuating shoreline. The revised PBF 1 focuses on the 
organic and natural inorganic structural features important to the 
narrow-headed gartersnake that fall within the stream channel and still 
encompass the transition between in-stream habitat and land habitat.
    Comment 42: One commenter stated that there are no currently 
available data on the effects of pollutants on the recruitment of 
narrow-headed gartersnakes; therefore, including PBF 1(C) for the 
narrow-headed gartersnake, which concerns water quality with low to 
zero levels of pollutants, is not using the best available science.
    Our Response: We do not have specific data related to the effects 
of water pollutants on the recruitment of the narrow-headed 
gartersnake. Therefore, in this rule, we have amended the relevant PBF 
to read as follows: ``Water quality that meets or exceeds applicable 
State surface water quality standards.'' (For more information, see 
Physical or Biological Features Essential to the Conservation of the 
Species, below). Although water quality is not identified as a direct 
threat to the narrow-headed gartersnake, it is a threat to its prey 
base. Water quality that is absent of pollutants or has low levels of 
pollutants is needed to support the fish prey base for the narrow-
headed gartersnake. State water quality standards identify levels of 
pollutants required to maintain communities of organisms that have a 
taxa richness, species composition, and functional organization that 
includes the fish prey base of the narrow-headed gartersnake.
    Comment 43: Two commenters stated that 89 ft (27 m) from the 
water's edge does not capture the lateral distance from streams that 
individual narrow-headed gartersnakes moved for brumation in Oak Creek 
Canyon, Arizona, which is between 276 and 328 ft (84 and 100 m).
    Our Response: We agree that terrestrial habitat as defined in PBF 
1(D) for the narrow-headed gartersnake does not include all known 
brumation sites for the species, including several sites located on 
steep slopes in Oak Creek Canyon that we discussed in the revised 
proposed rule (see ``Terrestrial Space Along Streams,'' 85 FR 23608, 
April 28, 2020, pp. 23614-23616). In the 2020 revised proposed rule, we 
modified that lateral extent boundary of critical habitat to 89 ft from 
the active channel of a stream based on the greatest average distance 
moved from water during the wet season on the Tularosa River in New 
Mexico from a 3-year study with a sample size of 69 individuals at two 
different sites. Because this study was conducted during the active 
season, it does not include brumation sites. We also did not include 
areas for brumation in PBF 1(D) for the narrow-headed gartersnake. This 
was an oversight, and we have added brumation to PBF 1(D) for narrow-
headed gartersnake in this final rule. As a result, we have also 
increased the lateral extent of critical habitat for the narrow-headed 
gartersnake up to 328 ft (100 m) from the water's edge, so that 
critical habitat includes additional areas for brumation along streams 
within narrow-walled canyons such as Oak Creek Canyon in Arizona (see 
Summary of Essential Physical or Biological Features, below). All areas 
included in this final rule as a result of increasing the lateral 
extent of critical habitat units was proposed as critical habitat for 
the narrow-headed gartersnake in the 2013 original proposed critical 
habitat rule (78 FR 41550; July 10, 2013).
    Comment 44: One commenter stated that the proposed critical habitat 
for the narrow-headed gartersnake in Eagle Creek in Greenlee County, 
Arizona, lacks recent detections, is primarily on Tribal land, and 
lacks habitat for the species because it is dominated by nonnative 
aquatic predators.
    Our Response: In the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we reviewed gartersnake occupancy to determine 
that a stream or stream reach was occupied at the time of listing for 
the narrow-headed gartersnake if it is within the historical range of 
the species, contains

[[Page 58485]]

PBFs for the species (although the PBFs concerning prey availability 
and presence of nonnative aquatic predators are often in degraded 
condition), and has a last known record of occupancy between 1998 and 
2019 (see Occupancy Records, 85 FR 23608, p. 23617-23619) (see Criteria 
Used To Identify Critical Habitat). The segment of Eagle Creek included 
in critical habitat for the narrow-headed gartersnake meets this 
definition, but the areas of it owned by the San Carlos Apache Tribe 
were excluded from this final designation.
    Comment 45: One commenter stated that we should determine occupancy 
at the time of listing (2014) from 1980 to today, as was done in the 
original proposed critical habitat rule (78 FR 41550; July 10, 2013), 
rather than 1998 to today, which was done in the revised proposed 
critical habitat rule (85 FR 23608; April 28, 2020). Repeated 
discoveries of populations of narrow-headed gartersnakes that were 
thought to be lost or were unknown indicates using 1980 as the earliest 
year to determine occupancy at the time of listing is therefore more 
appropriate. A lack of documentation of occupancy reflects incomplete 
survey effort rather than true non-occupancy.
    Our Response: As explained extensively in the revised proposed 
critical habitat rule (85 FR 23608; April 28, 2020), although it is 
possible that narrow-headed gartersnakes are still extant in areas 
where they were detected only during the 1980s or prior, we have 
determined that the best available information reflecting occupancy at 
the time of listing supports a more recent date of records since 1998.
    Based on our analyses in the listing rule (79 FR 38678; July 8, 
2014), we conclude that there has been a significant decline in the 
species over the past 50 years. This decline appeared to accelerate 
during the two decades immediately before listing occurred. From this 
observation, we conclude that many areas that were occupied by the 
species in surveys during the 1980s are likely no longer occupied 
because those populations have likely disappeared. To determine where 
loss of populations was most likely, we reviewed survey efforts after 
1989 that did not detect narrow-headed gartersnakes in some of the 
areas included in the original proposed critical habitat rule (78 FR 
41550; July 10, 2013). All surveys conducted since the 1980s that were 
considered included at least the same amount or more search effort than 
those surveys that detected the species in the 1980s. Since 1998, 
researchers have detected narrow-headed gartersnakes in many areas 
where they were found in the 1980s, and this includes some areas where 
they had not been found prior to the 2014 final listing rule (see 
Criteria Used To Identify Critical Habitat, below). An increase in a 
species' detection information often occurs as a result of a species 
being listed as an endangered or threatened species, due to increased 
survey effort spurred by consultation requirements under section 7, as 
well as recovery actions or State coordination efforts under section 6, 
of the Act. Additional occupancy information is also sometimes obtained 
as a result of academic research on a species. Because the best 
available information supports a conclusion that these areas were 
occupied at the time of listing, we have included these areas in 
critical habitat (see Criteria Used To Identify Critical Habitat, 
below).
    Comment 46: Multiple comments suggested we consider using longer 
stream lengths to determine gartersnake occupancy. A species might use 
a stream's entire wetted length, rather than just certain reaches, and 
the narrow-headed gartersnake had previously been connected in large 
stretches of river that are part of high-quality contiguous riparian 
habitat.
    Our Response: In the original proposed critical habitat rule (78 FR 
41550; July 10, 2013), we included the entire stream length of a 
perennial or intermittent stream if it had at least one known record 
for the narrow-headed gartersnake and at least one record of a native 
prey species present. In doing so, we included many areas that were not 
within the known range of the species, did not have records of the 
species, or did not contain the PBFs. For the revised proposed critical 
habitat rule (85 FR 23608; April 28, 2020), we reevaluated all streams 
based on comments and reports on water availability, prey availability, 
and surveys to determine which reaches contain the PBFs.
    In the revised proposed critical habitat rule (85 FR 23608; April 
28, 2020) and this final rule, critical habitat includes occupied 
streams or stream reaches within the historical range with survey 
records of the narrow-headed gartersnake dated from 1998 to 2019 that 
have retained the necessary PBFs that will allow for the maintenance 
and expansion of existing populations. We placed outer boundaries on 
the portion of a stream that is considered occupied. We identified the 
most upstream and downstream records of the narrow-headed gartersnake 
along each continuous stream reach determined by presence of PBFs, and 
we extended the stream reach to include a dispersal distance of 2.2 mi 
(3.6 km). After identifying the stream reaches that meet the above 
parameters, we then connected those reaches with intervening areas that 
have the PBFs. We consider these intervening areas occupied because the 
species occurs upstream and downstream and multiple PBFs are present 
that allow the species to move through these stream reaches.
    Comment 47: One commenter stated that critical habitat should 
include areas where native prey is limited and/or where nonnative 
species are present, for both occupied and unoccupied critical habitat, 
because narrow-headed gartersnakes can survive with low natural prey 
populations and the presence of nonnatives. Another commenter stated 
that we should not exclude stream reaches where other Federal, State, 
Tribal, or private entities may stock predatory sportfish regularly or 
as needed, because recovery of listed species should be prioritized in 
those areas.
    Our Response: This critical habitat designation includes many areas 
that are occupied by the narrow-headed gartersnake, where native prey 
is limited, and where nonnative species that prey on gartersnakes are 
present. Please see Final Critical Habitat Designation, below, for unit 
descriptions, including why units meet the definition of critical 
habitat for the narrow-headed gartersnake.
    Areas subject to stocking of predatory sportfish are not occupied 
by the narrow-headed gartersnake. We have not identified any unoccupied 
areas that meet the definition of critical habitat. Please see our 
response to Comment 50, below.
    Comment 48: One commenter stated that the gartersnake is currently 
distributed in stream reaches that are dominated by nonnative 
vertebrates and crayfish; therefore, the best available science does 
not support excluding areas as critical habitat based on an abundance 
of nonnative aquatic predators.
    Our Response: We acknowledge that the narrow-headed gartersnake is 
extant in some areas that have abundant nonnative aquatic predators, 
some of which also are prey for gartersnakes, so the presence of 
nonnative aquatic predators is not always indicative of absence of the 
gartersnake (Holycross et al. 2006). Although we acknowledge that we do 
not have a thorough understanding of narrow-headed gartersnake 
population dynamics in the presence of nonnative aquatic predators as 
compared to other areas, areas with aquatic predators that are 
currently known to support gartersnake

[[Page 58486]]

populations are included in this critical habitat designation. That 
said, we think it is reasonable to conclude, based on the best 
scientific data currently available, that streams or stream reaches 
should not be included in the final designation if the last known 
occupancy is prior to 1998 and the stream reaches have experienced a 
rapid decline in native prey species coupled with an increase in 
nonnative aquatic predators since gartersnakes were detected in these 
areas prior to 1998 (85 FR 23608; April 28, 2020).
    Comment 49: Several commenters stated that designation of 
unoccupied critical habitat is needed for the narrow-headed 
gartersnake. Specifically, habitat fragmentation, small populations, 
and genetics threaten the species with extinction and thus make 
unoccupied critical habitat essential. Designating unoccupied habitat 
is also important to restore connectivity among populations, and the 
Service should also consider reintroduction of the gartersnake to 
unoccupied areas.
    Our Response: As discussed in the final listing rule (79 FR 38678; 
July 8, 2014), continued population decline and extirpations threaten 
the genetic representation of the narrow-headed gartersnake because 
some populations have become disconnected and isolated from neighboring 
populations. This can lead to a reduction in the species' redundancy 
and resiliency when isolated, small populations are at increased 
vulnerability to the effects of threats and stochastic events, without 
a means for natural recolonization.
    As required by section 4(b) of the Act, we use the best scientific 
and commercial data available in determining areas within the 
geographical area occupied at the time of listing that contain the 
features essential to the conservation of the species and which may 
require special management considerations or protection, and areas 
outside of the geographical area occupied at the time of listing that 
are essential for the conservation of the species. However, based on 
the best scientific data available we have not identified any 
unoccupied areas that are essential for the conservation of the 
species. While we know the conservation of the species will depend on 
increasing the number and distribution of populations of the narrow-
headed gartersnake, not all of its historical range will be essential 
to the conservation of the species, and we are unable to delineate any 
specific unoccupied areas that are essential at this time. A number of 
areas within these watersheds continue to contain some or could develop 
many of the PBFs upon which the species depends, although the best 
available scientific data indicate all these areas are currently 
unoccupied. Some areas in these watersheds with the potential to 
support the PBFs are likely important to the overall conservation 
strategy for the narrow-headed gartersnake. Any specific areas 
essential to the species' conservation within these watersheds are not 
currently identifiable due to our limited understanding regarding the 
ideal configuration for the development of future habitat to support 
the narrow-headed gartersnake's persistence, and the ideal size, 
number, and configuration of these habitats. Although there may be a 
future need to expand the area occupied by the species to reach 
recovery, these areas have not been identified in recovery planning for 
the narrow-headed gartersnake. Therefore, we cannot identify unoccupied 
areas that are currently essential to the conservation of the species 
that should be designated as critical habitat.
    Comment 50: One commenter stated that only including areas occupied 
by the species at the time of listing does not allow for naturally 
occurring range expansion into other areas with suitable habitat that 
already exist or are newly created from habitat restoration activities.
    Our Response: Limiting critical habitat to areas occupied by a 
species at the time of listing does not prevent a species from 
naturally expanding into other areas. As discussed in the final listing 
rule (79 FR 38678; July 8, 2014), continued population decline and 
extirpations threaten the genetic representation of the narrow-headed 
gartersnake because some populations have become disconnected and 
isolated from neighboring populations. This can lead to a reduction in 
the species' redundancy and resiliency when isolated, small populations 
are at increased vulnerability to the effects of threats and stochastic 
events, without a means for natural recolonization.
    As required by section 4(b) of the Act, we use the best scientific 
and commercial data available in determining areas within the 
geographical area occupied at the time of listing that contain the 
features essential to the conservation of a species and which may 
require special management considerations or protection, and areas 
outside of the geographical area occupied at the time of listing that 
are essential for the conservation of the species. However, based on 
the best scientific data available we have not identified any 
unoccupied areas that that are essential for the conservation of the 
species. While we know the conservation of the species will depend on 
increasing the number and distribution of populations of the narrow-
headed gartersnake, not all of the species' historical range will be 
essential to the conservation of the species, and we are unable to 
delineate any specific unoccupied areas that are essential at this 
time. A number of areas within these watersheds continue to contain 
some, or could develop many, of the PBFs upon which the species 
depends, although the best available scientific data indicate all these 
areas are currently unoccupied. Some areas in these watersheds with the 
potential to support the PBFs are likely important to the overall 
conservation strategy for the narrow-headed gartersnake. Any specific 
areas essential to the species' conservation within these watersheds 
are not currently identifiable due to our limited understanding 
regarding the ideal configuration for the development of future habitat 
to support the narrow-headed gartersnake's persistence, and the ideal 
size, number, and configuration of these habitats. Although there may 
be a future need to expand the area occupied by the species to reach 
recovery, these areas have not been identified in recovery planning for 
the narrow-headed gartersnake. Therefore, we cannot identify unoccupied 
areas that are currently essential to the conservation of the species 
that should be designated as critical habitat.
    Comment 51: One commenter stated that there are recent sightings of 
narrow-headed gartersnakes in Turkey Creek (which is part of the Upper 
Gila River Subbasin), so this area should not have been removed from 
the original proposed critical habitat designation.
    Our Response: This record was from 2020, and we are not aware of 
any confirmed records between 1998 and 2019, as delineated in our rule 
set (see Occupancy Records, 85 FR 23608, p. 23617-23619) (see Criteria 
Used To Identify Critical Habitat), that document the narrow-headed 
gartersnake in Turkey Creek, so this site is not included in our 
critical habitat designation because it does not meet the definition of 
an occupied reach for the species.
    Comment 52: One commenter requested confirmation that upper and 
lower Oak Creek have been removed from critical habitat, both of which 
have recent sightings of narrow-headed gartersnakes.
    Our Response: This area has not been removed from the critical 
habitat designation. In the revised proposed critical habitat rule (85 
FR 23608; April

[[Page 58487]]

28, 2020), we reviewed gartersnake occupancy to determine that a stream 
or stream reach was occupied at the time of listing for narrow-headed 
gartersnake if it is within the historical range of the species, 
contains PBFs for the species (although the PBFs concerning prey 
availability and presence of nonnative aquatic predators are often in 
degraded condition), and has a last known record of occupancy between 
1998 and 2019. The segment of Oak Creek from its confluence with 
Sterling Canyon downstream to 800 ft before its confluence with Turkey 
Creek meets this definition and is included in this critical habitat 
designation for the narrow-headed gartersnake.
    Comment 53: Several commenters stated that our use of historical 
data spanning two decades to characterize areas of critical habitat 
that are ``occupied at the time of listing'' for purposes of a 
designation under section 3(5)(A)(i) of the Act is not synonymous with 
a determination that habitat is currently occupied for purposes of a 
``take'' analysis under sections 7 and 10 of the Act, and that the 
distinction between these two concepts needs to be fully acknowledged 
and its implications explained in the final rule.
    Our Response: We designate areas as critical habitat that are 
occupied at the time of listing if those areas have one or more of the 
PBFs present that are essential to the conservation of the species and 
may require special management considerations or protection (see 81 FR 
7414; February 11, 2016). In the 2020 revised proposed critical habitat 
rule (85 FR 23608; April 28, 2020), we estimated that maximum longevity 
for the narrow-headed gartersnake is 15 years, so it is reasonable to 
conclude that a gartersnake detected between 1998 and 2019 represents a 
population that could still be present at the time of listing in 2014, 
depending on the extent of threats in the area. We also included 
narrow-headed gartersnake detections after the species was listed 
because these areas were likely occupied at the time of listing in 
2014. As a result, there are areas in this final designation of 
critical habitat with records of gartersnakes from 1998 through 2019.
    Under section 7 of the Act, Federal agencies are required to 
consult with the Service to ensure that the actions they carry out, 
fund, or authorize are not likely to jeopardize the continued existence 
of the species, or destroy or adversely modify critical habitat. For a 
jeopardy or ``take'' analysis, we analyze effects to a species if the 
species is present in the action area during the time of the action. 
For an adverse modification analysis, we analyze effects to critical 
habitat if critical habitat for a species is present in the action 
area. Therefore, defining where a species is occupied at the time of 
listing for critical habitat designation is not synonymous with a 
determination that an area is currently occupied for purposes of a 
jeopardy analysis under section 7 of the Act or a ``take'' analysis 
under section 10 of the Act. Those determinations depend on the best 
available information at the time of the analysis, and the likely 
effects and likelihood of take depend on the action under 
consideration.
    Comment 54: One commenter stated that livestock grazing would have 
a significant impact on habitat for the narrow-headed gartersnake and 
that special management considerations and protection would benefit the 
species.
    Our Response: As discussed in the final listing rule (79 FR 38678; 
July 8, 2014), livestock grazing is a largely managed land use, and, 
where closely managed, it is not likely to pose significant threats to 
the narrow-headed gartersnake. In cases where poor livestock management 
results in fence lines in persistent disrepair, allowing unmanaged 
livestock access to occupied habitat, adverse effects from loss of 
vegetative cover, sedimentation, or alteration of prey base may result. 
Activities that significantly reduce cover or increase sedimentation 
are addressed below under Application of the ``Adverse Modification'' 
Standard and Special Management Considerations or Protection.
    Comment 55: One commenter stated that while we note that critical 
habitat units that have nonnative fish require special management, we 
do not explain how this management will be accomplished or whether it 
is even possible to reduce nonnatives to a level that will support 
narrow-headed gartersnakes.
    Our Response: We expect the science of removing nonnative fish will 
continue to evolve over time; for that reason, we did not prescribe 
specific methods of special management as part of this final 
designation. At this time, in the areas that require management of 
nonnative fish, special management may involve using mechanical or 
chemical methods to remove nonnative, invasive fish species.
    Comment 56: One commenter requested that we include a statement 
regarding the application of the ``adverse modification'' standard that 
existing activities are part of the baseline and, therefore, are 
presumed not to adversely modify critical habitat. The commenter 
further stated that we should affirmatively state that ``adverse 
modification'' will not be found where the agency, working with the 
project proponent, demonstrates that it will offset impacts to critical 
habitat through the protection and maintenance of alternative habitat 
within the designation, which is of comparable quality to the habitat 
that would be lost.
    Our Response: Section 7 of the Act requires us to ensure that any 
action authorized, funded, or carried out by the agency is not likely 
to destroy or adversely modify critical habitat. Therefore, only 
Federal action agencies are directly subject to the specific regulatory 
requirement (avoiding destruction and adverse modification) imposed by 
critical habitat designation. This adverse modification standard does 
not change whether the activities are ongoing or new, and we do not 
have a mechanism to determine that existing activities are presumed to 
not destroy or adversely modify critical habitat. Any new activity 
under section 7 will require evaluation of the effects of the action 
based on the specifics of the location of the project and its effects.
    Comment 57: Several commenters stated that we should consider an 
increased scope of economic impacts to small entities for the critical 
habitat rule. They also stated that the economic impact of the proposed 
designation would be significant on agricultural and ranching 
operations.
    Our Response: For the revised proposed critical habitat rule (85 FR 
23608; April 28, 2020), we made available, and requested public 
comments on, a draft economic analysis (DEA) to examine the incremental 
costs associated with the designation of critical habitat. Our DEA did 
not find that there would be significant economic impacts to 
agriculture from this designation of critical habitat. This analysis 
includes impacts to third-party entities, such as local governments and 
private landowners. Critical habitat does not restrict private 
landowner access to their property, and private landowners would only 
need to consult with the Service under section 7 of the Act if Federal 
agency funding or permitting for an activity is needed. Because the 
areas are considered occupied, most costs are not associated with the 
critical habitat designation, but rather with listing of the species as 
threatened. In our mapping of critical habitat, we focused on areas 
that contain the PBFs for the species. We do not anticipate requesting 
additional modifications for livestock grazing or agricultural 
operations, or cost-share projects undertaken with agencies such as the 
U.S. Department of Agriculture's Natural Resources

[[Page 58488]]

Conservation Service (NRCS), as a result of the critical habitat 
designation beyond those required for the species itself. The economic 
analysis outlines the substantial baseline protections currently 
afforded the narrow-headed gartersnake through its listed status under 
the Act and the presence of the species in all designated critical 
habitat units, as well as overlap with the designated critical habitat 
of other, similar listed species. As a result of these protections, the 
economic analysis concludes that incremental impacts associated with 
section 7 consultations for the narrow-headed gartersnake are likely 
limited to additional administrative effort. Many of the areas 
designated as critical habitat for the narrow-headed gartersnake are 
already designated critical habitat for other listed species, and thus 
the designation of critical habitat for the narrow-headed gartersnake 
is not anticipated to cause an incremental increase in economic 
effects.
    However, we recognize the potential for landowners' perceptions of 
the Act to influence land use decisions, including decisions to 
participate in Federal programs such as those managed by NRCS. Several 
factors can influence the magnitude of perception-related effects, 
including the community's experience with the Act and understanding of 
the degree to which future section 7 consultations could delay or 
affect land use activities. Information is not available to predict the 
impact of the designation of critical habitat on landowners' decisions 
to pursue cost-share projects with NRCS in the future. However, 
incremental effects due to the designation of critical habitat for the 
narrow-headed gartersnake are likely to be minimized because the 
species is already listed.
    Comment 58: One commenter requested we update the economic analysis 
to account for the impact of COVID-19 on economic conditions.
    Our Response: We do not anticipate any additional effects on 
economic conditions as a result of the impact of the COVID-19 pandemic. 
For the revised proposed critical habitat rule (85 FR 23608; April 28, 
2020), we made available, and requested public comments on, our DEA to 
examine the incremental costs associated with the designation of 
critical habitat. The DEA did not identify significant impacts. Because 
the critical habitat areas are considered occupied, the majority of 
costs are not associated with the critical habitat designation, but 
rather with listing of the species as threatened. If Federal funding is 
involved, the Federal agency providing the funding is the party 
responsible for meeting the Act's obligations to consult on projects on 
private lands. We have considered and applied the best available 
scientific and commercial information in determining the economic 
impacts associated with designating critical habitat. Critical habitat 
designation may also generate ancillary benefits by protecting the PBFs 
on which the species depends. As a result, management actions 
undertaken to conserve the species or its habitat may have coincident, 
positive social welfare implications, such as increased recreational 
opportunities in a region or improved property values on nearby 
parcels.

Background

    Critical habitat is defined in section 3 of the Act as:
    (1) The specific areas within the geographical area occupied by the 
species, at the time it is listed in accordance with the Act, on which 
are found those physical or biological features
    (a) Essential to the conservation of the species, and
    (b) Which may require special management considerations or 
protection; and
    (2) Specific areas outside the geographical area occupied by the 
species at the time it is listed, upon a determination that such areas 
are essential for the conservation of the species.
    Our regulations at 50 CFR 424.02 define the geographical area 
occupied by the species as an area that may generally be delineated 
around species' occurrences, as determined by the Secretary (i.e., 
range). Such areas may include those areas used throughout all or part 
of the species' life cycle, even if not used on a regular basis (e.g., 
migratory corridors, seasonal habitats, and habitats used periodically, 
but not solely by vagrant individuals).
    Conservation, as defined under section 3 of the Act, means to use 
and the use of all methods and procedures that are necessary to bring 
an endangered or threatened species to the point at which the measures 
provided pursuant to the Act are no longer necessary. Such methods and 
procedures include, but are not limited to, all activities associated 
with scientific resources management such as research, census, law 
enforcement, habitat acquisition and maintenance, propagation, live 
trapping, and transplantation, and, in the extraordinary case where 
population pressures within a given ecosystem cannot be otherwise 
relieved, may include regulated taking.
    Critical habitat receives protection under section 7 of the Act 
through the requirement that Federal agencies ensure, in consultation 
with the Service, that any action they authorize, fund, or carry out is 
not likely to result in the destruction or adverse modification of 
critical habitat. The designation of critical habitat does not affect 
land ownership or establish a refuge, wilderness, reserve, preserve, or 
other conservation area. Such designation does not allow the government 
or public to access private lands. Such designation does not require 
implementation of restoration, recovery, or enhancement measures by 
non-Federal landowners. Where a landowner requests Federal agency 
funding or authorization for an action that may affect a listed species 
or critical habitat, the Federal agency would be required to consult 
with the Service under section 7(a)(2) of the Act. However, even if the 
Service were to conclude that the proposed activity would result in 
destruction or adverse modification of the critical habitat, the 
Federal action agency and the landowner are not required to abandon the 
proposed activity, or to restore or recover the species; instead, they 
must implement ``reasonable and prudent alternatives'' to avoid 
destruction or adverse modification of critical habitat.
    Under the first prong of the Act's definition of critical habitat, 
areas within the geographical area occupied by the species at the time 
it was listed are included in a critical habitat designation if they 
contain physical or biological features (1) which are essential to the 
conservation of the species and (2) which may require special 
management considerations or protection. For these areas, critical 
habitat designations identify, to the extent known using the best 
scientific and commercial data available, those physical or biological 
features that are essential to the conservation of the species (such as 
space, food, cover, and protected habitat). In identifying those 
physical or biological features that occur in specific occupied areas, 
we focus on the specific features that are essential to support the 
life-history needs of the species, including, but not limited to, water 
characteristics, soil type, geological features, prey, vegetation, 
symbiotic species, or other features. A feature may be a single habitat 
characteristic or a more complex combination of habitat 
characteristics. Features may include habitat characteristics that 
support ephemeral or dynamic habitat conditions. Features may also be 
expressed in terms relating

[[Page 58489]]

to principles of conservation biology, such as patch size, distribution 
distances, and connectivity.
    Under the second prong of the Act's definition of critical habitat, 
we can designate critical habitat in areas outside the geographical 
area occupied by the species at the time it is listed, upon a 
determination that such areas are essential for the conservation of the 
species. The implementing regulations at 50 CFR 424.12(b)(2) further 
delineate unoccupied critical habitat by setting out three specific 
parameters: (1) When designating critical habitat, the Secretary will 
first evaluate areas occupied by the species; (2) the Secretary will 
only consider unoccupied areas to be essential where a critical habitat 
designation limited to geographical areas occupied by the species would 
be inadequate to ensure the conservation of the species; and (3) for an 
unoccupied area to be considered essential, the Secretary must 
determine that there is a reasonable certainty both that the area will 
contribute to the conservation of the species and that the area 
contains one or more of those physical or biological features essential 
to the conservation of the species.
    Section 4 of the Act requires that we designate critical habitat on 
the basis of the best scientific data available. Further, our Policy on 
Information Standards Under the Endangered Species Act (published in 
the Federal Register on July 1, 1994 (59 FR 34271)), the Information 
Quality Act (section 515 of the Treasury and General Government 
Appropriations Act for Fiscal Year 2001 (Pub. L. 106-554; H.R. 5658)), 
and our associated Information Quality Guidelines provide criteria, 
establish procedures, and provide guidance to ensure that our decisions 
are based on the best scientific data available. They require our 
biologists, to the extent consistent with the Act and with the use of 
the best scientific data available, to use primary and original sources 
of information as the basis for recommendations to designate critical 
habitat.
    When we are determining which areas should be designated as 
critical habitat, our primary source of information is generally the 
information from the information developed during the listing process 
for the species. Additional information sources may include any 
generalized conservation strategy, criteria, or outline that may have 
been developed for the species; the recovery plan for the species; 
articles in peer-reviewed journals; conservation plans developed by 
States and counties; scientific status surveys and studies; biological 
assessments; other unpublished materials; or experts' opinions or 
personal knowledge.
    Habitat is dynamic, and species may move from one area to another 
over time. We recognize that critical habitat designated at a 
particular point in time may not include all of the habitat areas that 
we may later determine are necessary for the recovery of the species. 
For these reasons, a critical habitat designation does not signal that 
habitat outside the designated area is unimportant or may not be needed 
for recovery of the species. Areas that are important to the 
conservation of the species, both inside and outside the critical 
habitat designation, will continue to be subject to: (1) Conservation 
actions implemented under section 7(a)(1) of the Act; (2) regulatory 
protections afforded by the requirement in section 7(a)(2) of the Act 
for Federal agencies to ensure their actions are not likely to 
jeopardize the continued existence of any endangered or threatened 
species; and (3) the prohibitions found in section 9 of the Act. 
Federally funded or permitted projects affecting listed species outside 
their designated critical habitat areas may still result in jeopardy 
findings in some cases. These protections and conservation tools will 
continue to contribute to recovery of the species. Similarly, critical 
habitat designations made on the basis of the best available 
information at the time of designation will not control the direction 
and substance of future recovery plans, habitat conservation plans 
(HCPs), or other species conservation planning efforts if new 
information available at the time of those planning efforts calls for a 
different outcome.

Physical or Biological Features Essential to the Conservation of the 
Species

    In accordance with section 3(5)(A)(i) of the Act and regulations at 
50 CFR 424.12, in determining which areas we will designate as critical 
habitat from within the geographical area occupied by the species at 
the time of listing, we consider the physical or biological features 
that are essential to the conservation of the species and that may 
require special management considerations or protection. The 
regulations at 50 CFR 424.02 define ``physical or biological features 
essential to the conservation of the species'' as the features that 
occur in specific areas and that are essential to support the life-
history needs of the species, including, but not limited to, water 
characteristics, soil type, geological features, sites, prey, 
vegetation, symbiotic species, or other features. A feature may be a 
single habitat characteristic or a more complex combination of habitat 
characteristics. Features may include habitat characteristics that 
support ephemeral or dynamic habitat conditions. Features may also be 
expressed in terms relating to principles of conservation biology, such 
as patch size, distribution distances, and connectivity. For example, 
physical features essential to the conservation of the species might 
include gravel of a particular size required for spawning, alkaline 
soil for seed germination, protective cover for migration, or 
susceptibility to flooding or fire that maintains necessary early-
successional habitat characteristics. Biological features might include 
prey species, forage grasses, specific kinds or ages of trees for 
roosting or nesting, symbiotic fungi, or a particular level of 
nonnative species consistent with conservation needs of the listed 
species. The features may also be combinations of habitat 
characteristics and may encompass the relationship between 
characteristics or the necessary amount of a characteristic essential 
to support the life history of the species.
    In considering whether features are essential to the conservation 
of the species, we may consider an appropriate quality, quantity, and 
spatial and temporal arrangement of habitat characteristics in the 
context of the life-history needs, condition, and status of the 
species. These characteristics include, but are not limited to, space 
for individual and population growth and for normal behavior; food, 
water, air, light, minerals, or other nutritional or physiological 
requirements; cover or shelter; sites for breeding, reproduction, or 
rearing (or development) of offspring; and habitats that are protected 
from disturbance.

Summary of Essential Physical or Biological Features

    We derive the specific physical or biological features essential to 
the conservation of the narrow-headed gartersnake from studies of the 
species' habitat, ecology, and life history as described below. 
Additional information can be found in the proposed and final listing 
rules published in the Federal Register on July 10, 2013 (78 FR 41500), 
and July 8, 2014 (79 FR 38678), respectively. The physical or 
biological features identified here focus primarily on foraging and 
dispersal habitat and secondarily on thermoregulation, shelter, and 
brumation habitat because most of the habitat relationship research 
data derived from studies of these activities for the narrow-headed 
gartersnake.

[[Page 58490]]

    We define the stream flow regimes that provide stream habitat for 
the narrow-headed gartersnake based on stream flow definitions in 
Levick et al. (2008, p. 6) and Stromberg et al. (2009, p. 330). A 
perennial stream or portion of a stream is defined as having surface 
flow continuously year-round, except for infrequent periods of severe 
drought (Levick et al. 2008, p. 6). An intermittent stream is a stream 
where portions flow continuously only at certain times of the year 
(Levick et al. 2008, p. 6). An intermittent stream flows when it 
receives water from a spring, a ground-water source, or a surface 
source (such as melting snow (i.e., seasonal)). During the dry seasons, 
frequently compounded by high evapotranspiration of watershed 
vegetation, the groundwater table may drop below the elevation of the 
streambed, causing surface flow to cease or reduce to a series of 
separate pools or short areas of flow (Gordon et al. 2004, p. 51). An 
ephemeral stream is usually dry except for brief periods immediately 
following precipitation, and its channel is at all times above the 
groundwater table (Levick et al. 2008, p. 6). In the range of the 
narrow-headed gartersnake, many streams have reaches with year-round 
water that are separated by intermittent or ephemeral reaches of flow, 
as a result of differences in geology along the stream. This variation 
of flow along a stream is common enough in the Southwest that 
hydrologists use the terms ``interrupted,'' ``perennial interrupted,'' 
or ``spatially intermittent'' to describe the spatial segmentation of a 
dryland stream into reaches that are perennial, intermittent, or 
ephemeral (Levick et al. 2008, p. 6; Stromberg et al. 2009, p. 330; 
Stromberg et al. 2013, p. 413). A stream that is interrupted, 
perennially interrupted, or spatially intermittent has perennial flow 
occurring in areas with shallow bedrock or high hydraulic connectivity 
to regional aquifers, and ephemeral to intermittent flow occurring in 
areas with deeper alluvial basins or greater distance from the 
headwaters (Stromberg et al. 2009, p. 330). The spatial patterning of 
wet and dry reaches on spatially intermittent streams changes through 
time in response to climatic fluctuations and to human modifications of 
the landscape (Stromberg et al. 2009, p. 331). In the remainder of this 
document, we use the terms ``perennial,'' ``spatially intermittent,'' 
and ``ephemeral'' in accordance with the above definitions.
    Narrow-headed gartersnakes are primarily found in rocky stretches 
of canyon-bound headwater streams that have perennial flow or limited 
spatially intermittent flow that is primarily perennial. Narrow-headed 
gartersnakes have been documented in pools and shallow portions of an 
intermittent flow reach of the Blue River with wet areas separated by 
dry segments of 0.6 to 1.2 miles (1 to 2 km) in length (Cotten et al. 
2017, p. 687). The wetted areas where gartersnakes were detected also 
had abundant native prey of the narrow-headed gartersnake, indicating 
that these areas may provide greater foraging opportunities during low 
flow periods (Cotten et al. 2017, p. 687). However, ephemeral reaches 
of streams do not provide habitat for narrow-headed gartersnakes. 
Within the range of the narrow-headed gartersnake, perennial streams 
become ephemeral as they approach their headwaters. Narrow-headed 
gartersnakes have not been found in these ephemeral reaches because 
their fish prey base is likely absent and there is no upstream 
perennial habitat, so the ephemeral reaches do not provide 
connectivity.
    Narrow-headed gartersnakes depend on terrestrial and aquatic 
habitat for all of their life-history functions, so it is important 
that hydrologic processes are present to maintain both the terrestrial 
and aquatic components of habitat for the species. Hydrologic processes 
are the flow regime and physical hydrologic and geomorphic connection 
that create and maintain a stream channel and continuously redefine the 
boundary between aquatic and terrestrial habitat used by the narrow-
headed gartersnake.
    We have determined that the following physical or biological 
features are essential to the conservation of the narrow-headed 
gartersnake:
    1. Perennial streams or spatially intermittent streams that provide 
both aquatic and terrestrial habitat that allows for immigration, 
emigration, and maintenance of population connectivity of narrow-headed 
gartersnakes and contain:
    (A) Pools, riffles, and cobble and boulder substrate, with a low 
amount of fine sediment and substrate embeddedness;
    (B) Organic and natural inorganic structural features (e.g., cobble 
bars, rock piles, large boulders, logs or stumps, aquatic vegetation, 
vegetated islands, logs, and debris jams) in the stream channel for 
basking, thermoregulation, shelter, prey base maintenance, and 
protection from predators;
    (C) Water quality that meets or exceeds applicable State surface 
water quality standards; and
    (D) Terrestrial habitat up to 328 feet (100 meters) from the active 
stream channel (water's edge) that includes flood debris, rock piles, 
and rock walls containing cracks and crevices, small mammal burrows, 
downed woody debris, and streamside vegetation (e.g., alder, willow, 
sedges, and shrubs) for thermoregulation, shelter, brumation, and 
protection from predators throughout the year.
    2. Hydrologic processes that maintain aquatic and riparian habitat 
through:
    (A) A natural flow regime that allows for periodic flooding, or if 
flows are modified or regulated, a flow regime that allows for the 
movement of water, sediment, nutrients, and debris through the stream 
network, as well as maintenance of native fish populations; and
    (B) Physical hydrologic and geomorphic connection between the 
active stream channel and its adjacent terrestrial areas.
    3. A combination of native fishes, and soft-rayed, nonnative fish 
species such that prey availability occurs across seasons and years.
    4. An absence of nonnative aquatic predators, such as fish species 
of the families Centrarchidae and Ictaluridae, American bullfrogs 
(Lithobates catesbeianus), and/or crayfish (Orconectes virilis, 
Procambarus clarki, etc.), or occurrence of these nonnative species at 
low enough levels such that recruitment of narrow-headed gartersnakes 
is not inhibited and maintenance of viable prey populations is still 
occurring.
    5. Elevations of 2,300 to 8,200 feet (700 to 2,500 meters).

Special Management Considerations or Protection

    When designating critical habitat, we assess whether the specific 
areas within the geographical area occupied by the species at the time 
of listing contain features which are essential to the conservation of 
the species and which may require special management considerations or 
protection.
    A detailed discussion of activities influencing the narrow-headed 
gartersnake and its habitat can be found in the final listing rule (79 
FR 38678; July 8, 2014). All areas of critical habitat will require 
some level of management to address the current and future threats to 
the narrow-headed gartersnake and to maintain or restore the PBFs. 
Special management within critical habitat will be needed to ensure 
these areas provide adequate water quantity, quality, and permanence or 
near permanence; cover (particularly in the presence of nonnative 
aquatic predators); an adequate prey base; and absence of or low 
numbers of nonnative aquatic

[[Page 58491]]

predators that can affect population persistence. Activities that may 
be considered adverse to the conservation benefits of critical habitat 
include those which: (1) Completely dewater or reduce the amount of 
water to unsuitable levels in critical habitat; (2) result in a 
significant reduction of protective cover within critical habitat when 
nonnative aquatic predator species are present; (3) remove or 
significantly alter structural terrestrial features of critical habitat 
that alter natural behaviors such as thermoregulation, brumation, 
gestation, and foraging; (4) appreciably diminish the prey base for a 
period of time determined to likely cause population-level effects; and 
(5) directly promote increases in nonnative aquatic predator 
populations, result in the introduction of nonnative aquatic predators, 
or result in the continued persistence of nonnative aquatic predators. 
Common examples of these activities may include, but are not limited 
to, various types of development, channelization, diversions, road 
construction, erosion control, bank stabilization, wastewater 
discharge, enhancement or expansion of human recreation opportunities, 
fish community renovations, and stocking of nonnative, spiny-rayed fish 
species or promotion of policies that directly or indirectly introduce 
nonnative aquatic predators as bait. The activities listed above are 
just a subset of examples that have the potential to affect critical 
habitat and PBFs if they are conducted within designated units; 
however, some of these activities, when conducted appropriately, may be 
compatible with maintenance of adequate PBFs or even improve upon their 
value over time. For activities planned within critical habitat, we 
encourage interested parties to contact the local Ecological Services 
field office (see FOR FURTHER INFORMATION CONTACT).

Criteria Used To Identify Critical Habitat

    As required by section 4(b)(2) of the Act, we use the best 
scientific data available to designate critical habitat. In accordance 
with the Act and our implementing regulations at 50 CFR 424.12(b), we 
review available information pertaining to the habitat requirements of 
the species and identify specific areas within the geographical area 
occupied by the species at the time of listing and any specific areas 
outside the geographical area occupied by the species to be considered 
for designation as critical habitat. We are not designating any areas 
as critical habitat outside the geographical area occupied by the 
species at the time of listing because we have not identified any 
unoccupied areas that meet the definition of critical habitat. Sites 
within the Gila River, San Francisco River, Salt River, and Verde River 
watersheds were previously occupied by the narrow-headed gartersnake. 
While we know the conservation of the species will depend on increasing 
the number and distribution of populations of the narrow-headed 
gartersnake, not all of its historical range will be essential to the 
conservation of the species, and we are unable to delineate any 
specific unoccupied areas that are essential at this time. A number of 
areas within these watersheds continue to contain some or could develop 
many of the physical and biological features upon which the species 
depends, although the best available scientific data indicate all these 
areas are currently unoccupied. Some areas in these watersheds with the 
potential to support the physical and biological features are likely 
important to the overall conservation strategy for the narrow-headed 
gartersnake. Any specific areas essential to the species' conservation 
within these watersheds are not currently identifiable due to our 
limited understanding regarding the ideal configuration for the 
development of future habitat to support the narrow-headed 
gartersnake's persistence, the ideal size, number, and configuration of 
these habitats. Finally, the specific areas needed for conservation 
will depend in part on landowner willingness to restore and maintain 
the species' habitat in these areas. Therefore, although there may be a 
future need to expand the area occupied by the narrow-headed 
gartersnake species to reach recovery, there are no unoccupied areas 
that are currently essential to the species conservation and that 
should be designated as critical habitat.
    To identify areas for critical habitat for the narrow-headed 
gartersnake, we used a variety of sources for species data including 
fish species survey reports, museum records, heritage data from State 
wildlife agencies, peer-reviewed literature, agency reports, and 
incidental sight records accompanied by photo vouchers and other 
supporting documentation verified by interviews with species experts. 
Holycross et al. (2020, entire) was a key source of information for 
vouchered historical and current records of the narrow-headed 
gartersnake species across its range. Other sources for current records 
of the narrow-headed gartersnake included Christman and Jennings (2017, 
entire), Hellekson (2012, entire), Jennings et al. (2017, entire), 
Jennings and Christman (2019, entire), and Jennings et al. (2018). In 
addition to reviewing gartersnake-specific survey reports, we also 
focused on survey reports and heritage data from State wildlife 
agencies for fish as they captured important data on the existing 
community ecology that affects the status of the narrow-headed 
gartersnake within its range. In addition to species data sources, we 
used publicly available geospatial datasets depicting water bodies, 
stream flow, elevation, and aerial imagery to identify areas for 
critical habitat designation.
    We determined that a stream or stream reach was occupied at the 
time of listing for narrow-headed gartersnake if it is within the 
historical range of the species, contains all PBFs for the species 
(although the PBFs concerning prey availability and presence of 
nonnative predators are often in degraded condition), and has a last 
known record of occupancy between 1998 and 2019. We determined 
occupancy at the time of listing for the narrow-headed gartersnake by 
reviewing all records for the species in conjunction with expected 
survivorship of the species, subsequent surveys in areas that had no 
detection of the species, and changes in threats over time that may 
have prevented occupancy at time of listing. Understanding longevity of 
a species can inform how long we can reasonably expect a species is 
still extant in an area, regardless of detection probability. Narrow-
headed gartersnakes may live up to 10 years or longer in the wild 
(Rosen and Schwalbe 1988, p. 38). An individual narrow-headed 
gartersnake captured in the wild as an adult was kept in captivity for 
11 years and is estimated to be 16 years old (Ryan 2020, pers. comm.). 
Based on this information, we estimate maximum longevity for the 
narrow-headed gartersnake is 15 years, so that it is reasonable to 
conclude that a gartersnake detected between 1998 and 2019 represents a 
population that could still be present at the time of listing in 2014, 
depending on the extent of threats in the area. Although it is possible 
that gartersnakes are still extant in areas where they were detected 
prior to 1998, we have determined that the best available information 
reflecting occupancy at the time of listing supports a more recent date 
of records since 1998.
    Based on our analyses in the final listing rule (79 FR 38678; July 
8, 2014), we conclude that there has been a significant decline in the 
species over the past 50 years. This decline appeared to accelerate 
during the two decades immediately before listing occurred.

[[Page 58492]]

From this observation, we conclude that many areas that were occupied 
by the species in surveys during the 1980s are likely no longer 
occupied because those populations have disappeared. To determine where 
loss of populations was likely, we reviewed survey efforts after 1989 
that did not detect gartersnakes to determine whether the cryptic 
nature of the species was a valid argument for considering areas that 
only have gartersnake records from the 1980s as still occupied at the 
time of listing in 2014. All of the surveys conducted since the 1980s 
included at least the same amount or more search effort than those 
surveys that detected each species in the 1980s. Since 1998, 
researchers have detected narrow-headed gartersnakes in many areas 
where they were found in the 1980s. Areas where the species was found 
after 1997 are included in this final rule. Additionally, comparable 
surveys did detect gartersnakes in other areas where the species was 
present in the 1980s. Finally, we would expect that some populations 
would be lost during the decades preceding listing when numbers of 
gartersnakes were declining. These declines are what eventually led to 
the need to list the narrow-headed gartersnake.
    As explained in the final listing rule (79 FR 38678, July 8, 2014, 
pp. 38688-38702), aquatic vertebrate survey efforts throughout the 
range of the narrow-headed gartersnake indicate that native prey 
species of narrow-headed gartersnakes have decreased or are absent, 
while nonnative predators of gartersnakes and their prey, including 
bullfrogs, crayfish, and spiny-rayed fish, continue to increase in many 
of the areas where narrow-headed gartersnakes were present in the 1980s 
(Emmons and Nowak 2012, pp. 11-14; Gibson et al. 2015, pp. 360-364, 
Jennings et al. 2020, p. 15). We acknowledge that narrow-headed 
gartersnakes are extant in some areas that have abundant nonnative 
aquatic predators, some of which also are prey for gartersnakes, so 
presence of nonnative aquatic predators is not always indicative of 
absence of these gartersnakes (Emmons and Nowak 2012, p. 31). We also 
acknowledge that we do not have a good understanding of why gartersnake 
populations are able to survive in some areas with nonnative aquatic 
predators and not in other areas. However, we think it is reasonable to 
conclude that streams and stream reaches were not occupied at the time 
of listing if they have only gartersnake records older than 1998 and 
have experienced a rapid decline in native prey species coupled with an 
increase in nonnative aquatic predators since gartersnakes were 
detected in these areas in the 1980s.
    We included detections of the narrow-headed gartersnake that 
occurred after the species was listed because these areas were likely 
occupied at the time of listing in 2014. As stated earlier, the species 
is cryptic in nature and may not be detected without intensive surveys. 
Because populations of this species are generally small, isolated, and 
in decline, it is not likely that the species has colonized new areas 
since 2014; these areas were most likely occupied at the time of 
listing, but either had not been surveyed or the species was present 
but not detected during surveys. However, we did not include streams 
where narrow-headed gartersnakes were released for recovery purposes 
after the species was listed that had not been historically occupied by 
the species.
    Stream reaches that lack PBFs include areas where water flow became 
completely ephemeral along an otherwise perennial or spatially 
intermittent stream, hydrologic processes needed to maintain streams 
could not be recovered, nonnative aquatic predators outnumbered native 
prey species, or streams were outside the elevation range. In addition, 
reaches with multiple negative surveys without a subsequent positive 
survey or reaches that have no records of the narrow-headed gartersnake 
species are not included. We do include stream reaches that lack survey 
data for the species, if they have positive observation records of the 
species dated 1998 or later both upstream and downstream of the stream 
reach and have all of the PBFs.
    We also reviewed the best available information we have on home 
range size and potential dispersal distance for the narrow-headed 
gartersnake species to inform upstream and downstream boundaries of 
each unit and subunit of critical habitat. The maximum longitudinal 
distance measured across home range areas of a male narrow-headed 
gartersnake tracked for 51 days over 3 years during the dry and wet 
seasons was approximately 1,312 ft (400 m) (Jennings and Christman 
2012, p. 10). The maximum longitudinal distance measured across home 
ranges areas ranged from 82 to 656 ft (25 to 200 m) for eight other 
narrow-headed gartersnakes tracked at least 6 days over 1 to 2 years 
(Jennings and Christman 2012, pp. 9-10). These longitudinal home range 
distances were all determined from adult gartersnakes and did not 
inform how juvenile gartersnakes are dispersing along a stream. 
Juvenile dispersal is important because snakes of different age classes 
behave differently, and juvenile gartersnakes may move farther along a 
stream as they search for and establish suitable home ranges than do 
adults with established home ranges. Because we have no information on 
how juvenile narrow-headed gartersnakes disperse, we used information 
from a long-term dispersal study on neonate, juvenile, and adult age 
classes of the Oregon gartersnake (Thamnophis atratus hydrophilus) in a 
free-flowing stream environment in northern California (Welsh et al. 
2010, entire). This is the only dispersal study available for another 
aquatic Thamnophis species in the United States, so we used it as a 
surrogate for determining upstream and downstream movements of narrow-
headed gartersnakes. The greatest movement was made by a juvenile 
recaptured as an adult 2.2 mi (3.6 km) upstream from the initial 
capture location (Welsh et al. 2010, p. 79). Therefore, in this final 
rule, we delineate upstream and downstream critical habitat boundaries 
of a stream reach at 2.2 mi (3.6 km) from a known narrow-headed 
gartersnake observation record.
    In this final rule, we modified the lateral extent of critical 
habitat to include areas of brumation habitat since we inadvertently 
left out brumation habitat as part of PBF 1(D) in the revised proposed 
rule (85 FR 23608; April 28, 2020). We now incorporate the best 
information available on brumation habitat and other terrestrial 
habitat use of the narrow-headed gartersnake to inform lateral 
boundaries of each unit and subunit of critical habitat. There are 
three reported narrow-headed gartersnakes using brumation sites on 
steep slopes in Oak Creek Canyon, Arizona (Nowak 2006, pp. 19-20). 
Horizontal distances from stream centerline to these brumation sites 
ranged between 276 and 328 ft (84 and 101 m) (Nowak 2015, pers. comm.). 
There were also at least five other individual narrow-headed 
gartersnakes overwintering at brumation sites that were not on steep 
slopes at 66 to 98 ft (20 to 30 m) from the water's edge (Nowak 2006, 
pp. 20-21). The distance from the stream appeared to be dependent on 
the adjacent terrestrial topography so that gartersnakes were found 
farther from the stream in steeper terrain. The Nowak (2006) study is 
the only study that has documented brumation sites of telemetered 
narrow-headed gartersnakes.
    Although we have no information on brumation sites in New Mexico, 
we have information on how narrow-headed gartersnakes moved in three 
different stream channels during the active season. A telemetry study 
of

[[Page 58493]]

narrow-headed gartersnakes on the Tularosa River, Gila River, and 
Whitewater Creek during two active (wet and dry) seasons of narrow-
headed gartersnakes found individuals an average of 58.7 ft (17.9 m) 
from water across four different sites on the three streams with a 
sample size of 69 individuals (Jennings and Chirstman 2012, pp. 9-10). 
Narrow-headed gartersnakes were found with lowest average distance of 
22.7 ft (6.9 m) during the dry season of 2010, and highest average 
distance of 88.3 ft (26.9 m) during the wet season in 2010 (Jennings 
and Chirstman 2012, pp. 9-10). While narrow-headed gartersnakes in New 
Mexico have been documented up to 285 ft (87 m) from water, most snakes 
are found within 3.28 ft (1 m) of the water's edge during both active 
seasons (Jennings and Christman 2012, pp. 9-10). During the active 
season, individual narrow-headed gartersnakes were most often found 
outside of water under boulders, small rocks, and broken concrete slabs 
located less than 328 ft (100 m) from the water in Oak Creek and West 
Fork Oak Creek (Nowak 2006, p. 26).
    Sites much farther from water where gartersnakes were found in both 
Arizona and New Mexico during the active season may provide lower 
predation risk, protection from flooding, and warmer temperatures that 
are advantageous during gestation, after a large meal, or when snakes 
are more vulnerable prior to molting (Jennings and Christman 2012, p. 
21). Brumation sites documented in Arizona by Nowak (2006) are likely 
higher in steeper terrain because of the thermal gradient in canyon 
habitats during winter: Temperatures increase dramatically in areas hit 
by sun at the tops of these canyons that get some amount of direct 
sunlight in winter. Higher brumation sites may also prevent the 
gartersnakes from being flooded out of these sites during high stream 
flow events.
    Therefore, in this final rule, we delineate lateral extent of 
critical habitat boundaries of a stream to fall within 328 ft (100 m) 
of the active channel of a stream. Lateral extent varies based on 
topography as explained above. The active channel effectively defines a 
river or stream as a feature on the landscape (Mersel and Lichvar 2014, 
pp. 11-12). The active channel is established and maintained by flows 
that occur with some regularity (several times per year to several 
times per decade), but not by very rare and extremely high flood 
events. The outer limits of the active channel can generally be defined 
by three primary indicators that together form a discernable mark on 
the landscape: A topographic break in slope, change in vegetation 
characteristics, and change in sediment characteristics (Mersel and 
Lichvar 2014, pp. 13-14). The active channel is often a fairly obvious 
and easy feature to identify in the field, allowing for rapid and 
consistent identification (Mersel and Lichvar 2014, p. 14). Further, 
the active channel can be consistently recognized by the public. Any 
area that was added in this final rule as a result of increasing the 
lateral extent of critical habitat units was included in the 2013 
original proposed critical habitat rule for the narrow-headed 
gartersnake (78 FR 41550; July 10, 2013).
    The maps define the critical habitat designation, as modified by 
any accompanying regulatory text, presented at the end of this document 
under Regulation Promulgation. We include more detailed information on 
the boundaries of the critical habitat designation in the preamble of 
this document.
    In summary, for areas within the geographic area occupied by the 
species at the time of listing, we delineated critical habitat unit 
boundaries using the following criteria:
    1. We mapped records of the narrow-headed gartersnake from 1998 to 
2019. We then examined these areas to determine if narrow-headed 
gartersnakes could still occur in them, as described below.
    2. We identified the streams in which narrow-headed gartersnakes 
were found since 1998 (used flowline layer in the U.S. Geological 
Survey (USGS) National Hydrography Dataset to represent stream 
centerlines).
    3. We identified and removed upstream and downstream ends of 
streams that were below 2,300 ft or above 8,200 ft in elevation using 
USGS National Elevation Dataset.
    4. We identified perennial, intermittent, and ephemeral reaches of 
streams. We removed upstream end reaches of streams that are ephemeral 
or intermittent based on FCode attribute of the flowline layer in the 
USGS National Hydrography Dataset or information from peer review and 
public comments.
    5. We identified native and nonnative prey species along each 
stream using geospatial datasets, literature, peer review, and public 
comments. We removed stream reaches that did not have prey species.
    6. We identified and removed stream reaches with an abundance of 
nonnative aquatic predators including fish, crayfish, or bullfrogs. (We 
used a combination of factors to determine nonnative presence and 
impact to the species. This evaluation included records from 1980 by 
looking at subsequent negative survey data for narrow-headed 
gartersnakes along with how the nonnative aquatic predator community 
had changed since those gartersnakes were found, in addition to the 
habitat condition and complexity. Most of the areas surveyed in the 
1980s that had been re-surveyed with negative results for gartersnakes 
had significant changes to the nonnative aquatic predator community, 
which also decreased prey availability for the gartersnakes.) These 
areas were removed in our revised proposed critical habitat rule (85 FR 
23608; April 28, 2020).
    7. We identified and removed stream reaches where stocking or 
management of nonnative fish species of the families Centrarchidae and 
Ictaluridae is a priority and is conducted on a regular basis.
    8. We identified and included those stream reaches on private land 
without public access that lack survey data but that have positive 
narrow-headed gartersnake survey records from 1998 forward both 
upstream and downstream of the private land and have stream reaches 
with PBFs 1 and 2.
    9. We used a surrogate species to determine potential neonate 
dispersal along a stream, which is 2.2 mi (3.6 km). We then identified 
the most upstream and downstream records of narrow-headed gartersnake 
along each continuous stream reach determined by criteria 1 through 8, 
above, and extended the reach to include this dispersal distance.
    10. After identifying the stream reaches that met the above 
parameters, we then connected those reaches between that have the PBFs. 
We consider these areas between survey records occupied because the 
species occurs upstream and downstream and multiple PBFs are present 
that allow the species to move through these stream reaches.
    11. We identified the range of the maximum distance that narrow-
headed gartersnakes have been documented from the water's edge in 
streams, which is 98 to 328 ft (30 to 100 m), to capture the upper 
limit of terrestrial habitat needed by the species for brumation, 
thermoregulation, and protection from predators. We used the USGS 
National Hydrography Dataset, wetland layer of the Service's National 
Wetlands Inventory dataset, and aerial photography in Google Earth Pro 
to identify the water's edge in streams (active channel).
    12. We removed terrestrial areas between 30 m and 100 m lateral 
extent of the active channel that do not contain

[[Page 58494]]

PBFs and areas beyond steep walled canyons that are not accessible to 
the species.
    When determining critical habitat boundaries, we made every effort 
to avoid including developed areas such as lands covered by buildings, 
pavement, and other structures because such lands lack PBFs necessary 
for the narrow-headed gartersnake. The scale of the maps we prepared 
under the parameters for publication within the Code of Federal 
Regulations may not reflect the exclusion of such developed lands. Any 
such lands inadvertently left inside critical habitat boundaries shown 
on the maps of this rule have been excluded by text in the rule and are 
not designated as critical habitat. Therefore, a Federal action 
involving these lands will not trigger section 7 consultation with 
respect to critical habitat and the requirement of no adverse 
modification unless the specific action will affect the PBFs in the 
adjacent critical habitat. However, constructed fish barriers in 
streams within the designated critical habitat are part of the 
designation and are needed to manage the exclusion of nonnative 
species. Accordingly, section 7 consultation applies to actions 
involving such fish barriers.
    We are designating as critical habitat lands that we have 
determined were occupied at the time of listing in 2014 and that 
contain one or more of the PBFs that are essential to support life-
history processes of the species. As described above, we are not 
designating any areas outside the geographical area occupied by the 
species at the time of listing.
    Units are designated based on one or more of the PBFs being present 
to support the narrow-headed gartersnake's life-history processes. Some 
units contain all of the identified PBFs and support multiple life-
history processes. Some units contain only some of the PBFs necessary 
to support the narrow-headed gartersnake's use of that habitat.
    The critical habitat designation is defined by the map or maps, as 
modified by any accompanying regulatory text, presented at the end of 
this document under Regulation Promulgation. We include more detailed 
information on the boundaries of the critical habitat designation in 
the preamble of this document. We will make the coordinates or plot 
points or both on which each map is based available to the public on 
http://www.regulations.gov at Docket No. FWS-R2-ES-2020-0011, on our 
internet site https://www.fws.gov/southwest/es/Arizona/, and upon 
request from the field office responsible for the designation (see FOR 
FURTHER INFORMATION CONTACT).

Final Critical Habitat Designation

    We are designating eight units as critical habitat for the narrow-
headed gartersnake. The critical habitat areas we describe below 
constitute our current best assessment of areas that meet the 
definition of critical habitat for the narrow-headed gartersnake.
    The eight areas we designate as critical habitat for the narrow-
headed gartersnake are: (1) Upper Gila River Subbasin; (2) San 
Francisco River Subbasin; (3) Blue River Subbasin; (4) Eagle Creek; (5) 
Black River Subbasin; (6) Canyon Creek; (7) Tonto Creek Subbasin; and 
(8) Verde River Subbasin. Table 1 shows the critical habitat units and 
the approximate area of each unit. All units are considered occupied at 
the time of listing.

                                              TABLE 1--Critical Habitat Units for Narrow-Headed Gartersnake
                                        [Area estimates reflect all land within critical habitat unit boundaries]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                 Land ownership by type acres (hectares)
                  Unit                            Subunit          -------------------------------------------------------------------    Size of unit
                                                                         Federal            State          Tribal          Private
--------------------------------------------------------------------------------------------------------------------------------------------------------
1. Upper Gila River Subbasin...........  Gila River...............        1,191 (482)       315 (127)  ..............     2,267 (917)      3,773 (1,527)
                                         West Fork Gila River.....          615 (249)        228 (92)  ..............          21 (8)          864 (350)
                                         Little Creek.............          281 (114)           9 (4)  ..............  ..............          291 (118)
                                         Middle Fork Gila River...          978 (396)  ..............  ..............  ..............          978 (396)
                                         Iron Creek...............           111 (45)  ..............  ..............  ..............           111 (45)
                                         Gilita Creek.............          376 (152)  ..............  ..............  ..............          376 (152)
                                         Black Canyon.............          300 (121)  ..............  ..............           8 (3)          308 (125)
                                         Diamond Creek............           231 (93)  ..............  ..............         73 (29)          303 (123)
    Unit Total.........................  .........................      4,084 (1,653)       553 (224)  ..............     2,368 (958)      7,005 (2,835)
2. San Francisco River Subbasin........  San Francisco River......        2,128 (861)  ..............  ..............     1,194 (483)      3,322 (1,344)
                                         Whitewater Creek.........          254 (103)           3 (1)  ..............        125 (51)          382 (155)
                                         Saliz Creek..............           194 (78)  ..............  ..............         68 (27)          261 (106)
                                         Tularosa River...........          444 (180)  ..............  ..............       471 (191)          915 (370)
                                         Negrito Creek............          543 (220)  ..............  ..............         90 (36)          632 (256)
                                         South Fork Negrito Creek.          362 (147)  ..............  ..............          20 (8)          382 (155)
    Unit Total.........................  .........................      3,924 (1,588)           3 (1)  ..............     1,967 (796)      5,895 (2,386)
3. Blue River Subbasin.................  Blue River...............      2,595 (1,050)  ..............  ..............       430 (174)      3,025 (1,224)
                                         Campbell Blue Creek......           200 (81)  ..............  ..............          21 (8)           220 (89)
                                         Dry Blue Creek...........           122 (50)  ..............  ..............  ..............           122 (50)
    Unit Total.........................  .........................      2,918 (1,181)  ..............  ..............       450 (182)      3,368 (1,363)
4. Eagle Creek.........................  .........................            84 (34)  ..............  ..............       0.4 (0.2)            84 (34)
    Unit Total.........................  .........................            84 (34)  ..............  ..............       0.4 (0.2)            84 (34)
5. Black River Subbasin................  Black River..............          796 (322)  ..............  ..............  ..............          796 (322)
                                         Bear Wallow Creek........           183 (74)  ..............  ..............  ..............           183 (74)
                                         North Fork Bear Wallow               80 (32)  ..............  ..............  ..............            80 (32)
                                          Creek.
                                         Reservation Creek........           149 (60)  ..............  ..............  ..............           149 (60)
                                         Fish Creek...............           135 (55)  ..............  ..............  ..............           135 (55)
                                         East Fork Black River....          436 (176)  ..............  ..............  ..............          436 (176)

[[Page 58495]]

 
    Unit Total.........................  .........................        1,780 (720)  ..............  ..............  ..............        1,780 (720)
6. Canyon Creek........................  .........................           204 (82)  ..............  ..............  ..............           204 (82)
    Unit Total.........................  .........................           204 (82)  ..............  ..............  ..............           204 (82)
7. Tonto Creek Subbasin................  Tonto Creek..............        1,673 (677)  ..............  ..............         91 (37)        1,764 (714)
                                         Houston Creek............            30 (12)  ..............  ..............         1 (0.4)            31 (12)
                                         Haigler Creek............          473 (191)  ..............  ..............         26 (10)          499 (202)
    Unit Total.........................  .........................        2,176 (881)  ..............  ..............        117 (47)        2,293 (928)
8. Verde River Subbasin................  Verde River..............        1,439 (583)  ..............  ..............        180 (73)        1,619 (655)
                                         Oak Creek................          634 (256)        109 (44)  ..............       422 (171)        1,165 (471)
                                         West Fork Oak Creek......          372 (151)  ..............  ..............  ..............          372 (151)
    Unit Total.........................  2,446 (990)..............           109 (44)  ..............       602 (244)   3,156 (1,277)  .................
                                        ----------------------------------------------------------------------------------------------------------------
    Total..............................  .........................     17,614 (7,128)       665 (269)  ..............   5,505 (2,228)     23,785 (9,625)
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note: Area sizes may not sum due to rounding.

    We present brief descriptions of all units, and reasons why they 
meet the definition of critical habitat for the narrow-headed 
gartersnake, below.

Unit 1: Upper Gila River Subbasin Unit

    Unit 1 consists of 7,005 ac (2,835 ha) in eight subunits along 104 
stream mi (167 km): 46 stream mi (74 km) of the Gila River, 12 stream 
mi (20 km) of West Fork Gila River, 7 stream mi (11 km) of Little 
Creek, 14 stream mi (23 km) of Middle Fork Gila River, 6 stream mi (10 
km) of Gilita Creek, 2 stream mi (3 km) of Iron Creek, 10 stream mi (16 
km) of Black Canyon, and 6 stream mi (9 km) of Diamond Creek. The Upper 
Gila River Subbasin Unit is located in southwestern New Mexico, east of 
the town of Glenwood, and west and north of Silver City in Grant and 
Hidalgo Counties. The Upper Gila River Subbasin Unit occurs on lands 
managed by the USFS on Gila National Forest; Bureau of Land Management 
(BLM) within Lower Box and Middle Gila Box Areas of Critical 
Environmental Concern and Gila Lower Box Wilderness Study Area; 
National Park Service (NPS) on Gila Cliff Dwellings National Monument; 
New Mexico Department of Game and Fish on Bill Evans Fishing Area, 
Heart Bar Wildlife Area, Redrock State Wildlife Experimental Area, and 
Gila Bird Area; State Trust lands; and private entities.
    Unit 1 is designated as critical habitat because it was occupied at 
the time of listing and as a whole, this unit contains PBFs 1, 2 and 5, 
with PBFs 3 and 4 may be in degraded condition. The Gila River, West 
Fork Gila River, Little Creek, Iron Creek, Black Canyon, and Diamond 
Creek subunits have PBFs 1, 2, 3, and 5, but PBF 4 is in degraded 
condition. The Middle Fork Gila River Subunit has PBF 1, 2, 4, and 5 
with PBF 3 in degraded condition. Gilita Creek Subunit has all PBFs.
    This unit requires special management to address the threats; some 
reaches of the Gila River have been adversely affected by 
channelization and water diversions. Populations of bullfrogs and 
nonnative, spiny-rayed fish dominate the aquatic community in some 
reaches of the West Fork and Middle Fork Gila River. Fish barriers on 
many streams are in place to limit upstream movement of some nonnative 
fish into areas that are managed for native fish. Crayfish densities 
are currently high in Diamond Creek. Wildfires have burned at both 
moderate and high severity within the unit and resulted in significant 
flooding with excessive ash and sediment loads in Middle Fork Gila 
River. These sediment and ash-laden floods can temporarily reduce 
populations of both nonnative aquatic predatory species and native prey 
species for narrow-headed gartersnakes in affected streams. The PBFs in 
this unit may require special management due to competition with, and 
predation by, nonnative species that are present in this unit; water 
diversions; channelization; potential for high-intensity wildfires; and 
human development of areas adjacent to critical habitat.

Unit 2: San Francisco River Subbasin Unit

    Unit 2 consists of 5,895 ac (2,386 ha) in six subunits along 129 
stream mi (207 km): 71 stream mi (115 km) of San Francisco River, 9 
stream mi (14 km) of Whitewater Creek, 8 stream mi (13 km) of Saliz 
Creek, 20 stream mi (33 km) of Tularosa River, 13 stream mi (20 km) of 
Negrito Creek, and 8 stream mi (13 km) of South Fork Negrito Creek. The 
San Francisco River Subbasin Unit is generally located in southwestern 
New Mexico near the towns of Glenwood and Reserve, and east of Luna, in 
Catron County. The San Francisco River Subbasin Unit consists of lands 
managed primarily by the U.S. Forest Service on Gila National Forest 
and private landowners.
    Unit 2 is designated as critical habitat because it was occupied at 
the time of listing and as a whole, this unit contains PBFs 1, 2, and 
5, but PBFs 3 and 4 may be in degraded condition. San Francisco River 
Subunit has PBFs 1, 2, and 5, but PBFs 3 and 4 are in degraded 
condition. Whitewater Creek Subunit has PBFs 1, 2, 4, and 5, but PBF 3 
is in degraded condition. Tularosa River, Saliz Creek, and Negrito 
Creek subunits have PBFs 1, 2, 3, and 5, but PBF 4 is in degraded 
condition. South Fork Negrito Creek Subunit has adequate PBFs. Water 
diversions have dewatered sections of the San Francisco River Subunit 
in the upper Alma Valley and at Pleasanton, New Mexico. The San 
Francisco River Subunit also has populations of bullfrogs, crayfish, 
and nonnative, spiny-rayed fish at various densities along its course. 
Wildfires have burned at both moderate and high severity within the 
unit and likely resulted in significant flooding with excessive ash and 
sediment loads. These sediment and ash-laden floods can temporarily 
reduce populations of both nonnative aquatic predatory species and 
native prey species for narrow-headed gartersnakes in affected streams. 
The PBFs in this unit may require special management due to competition 
with,

[[Page 58496]]

and predation by, nonnative species that are present in this unit; 
water diversions; potential for high-intensity wildfires; and human 
recreation and development of areas adjacent to critical habitat.

Unit 3: Blue River Subbasin Unit

    Unit 3 consists of a total of 3,368 ac (1,363 ha) in three subunits 
along 64 stream mi (102 km): 52 stream mi (84 km) of Blue River, 7 
stream mi (12 km) of Campbell Blue Creek, and 4 stream mi (7 km) of Dry 
Blue Creek. The Blue River Subbasin Unit is generally located near the 
east-central border of Arizona northeast of Clifton in Greenlee County, 
and just into west-central New Mexico in Catron County. Blue River 
Subbasin Unit consists of lands managed primarily by the U.S. Forest 
Service on Gila and Apache-Sitgreaves National Forests, and private 
landowners.
    Unit 3 is designated as critical habitat because it was occupied at 
the time of listing and as a whole, this unit contains PBFs 1, 2, and 
5, but PBFs 3 and 4 may be in degraded condition. The Blue River and 
Dry Blue Creek subunits have PBFs 1, 2, 3, and 5, but PFB 4 is in 
degraded condition. Campbell Blue Creek Subunit has PBFS 1, 2, 4, and 
5, but PBF 3 may be in degraded condition. The fish community of the 
Blue River is highly diverse and largely native, but nonnative fish are 
present. Native fish restoration is actively occurring in the Blue 
River, including construction of a fish barrier, mechanical removal of 
nonnative fish, and repatriation and monitoring of federally listed 
warm-water fishes (Robinson and Crowder 2015, p. 24; Robinson and Love-
Chezem 2015, entire). Native fish species persist in Campbell Blue 
Creek and Dry Blue Creek (Riley and Clarkson 2005, p. 10; Humphrey et 
al. 2015, Table 2). Crayfish and brown trout are present in Campbell 
Blue Creek (Humphrey et al. 2015, Table 2; Bergamini et al. 2016a, p. 
1; Nowak et al. 2017, Table 3; Pittenger 2017, Table 3). Wildfires have 
burned at both moderate and high severity within the unit and likely 
resulted in significant flooding with excessive ash and sediment loads. 
These sediment and ash-laden floods can temporarily reduce populations 
of both nonnative aquatic predatory species and native prey species for 
narrow-headed gartersnakes in affected streams. The PBFs in this unit 
may require special management to prevent reinvasion of nonnative 
species and continue to reestablish native prey species.

Unit 4: Eagle Creek Unit

    Unit 4 consists of a total of 84 ac (34 ha) along 2 stream mi (4 
km) of Eagle Creek. The Eagle Creek Unit is generally located in 
eastern Arizona near Morenci and includes portions of Greenlee County. 
The majority of lands within this unit are managed by the U.S. Forest 
Service on the Gila National Forest.
    Unit 4 is designated as critical habitat because it was occupied at 
the time of listing and as a whole, this unit contains PBFs 1, 2, 3, 4, 
and 5, but PBF 4 is in degraded condition. Narrow-headed gartersnakes 
have been found in Eagle Creek at its confluence with Sheep Wash in 
2013 (Ehlo et al. 2013, p. 3; Holycross et al. 2020, p. 717). The PBFs 
in this unit may require special management to eliminate or reduce 
crayfish and nonnative, spiny-rayed fish, as well as maintain adequate 
base flow in Eagle Creek.
    We have excluded 236 ac (96 ha) of lands owned by the San Carlos 
Apache Tribe in the Eagle Creek Unit (see Consideration of Impacts 
under Section 4(b)(2) of the Act, below).

Unit 5: Black River Subbasin Unit

    Unit 5 consists of a total of 1,780 ac (720 ha) in six subunits 
along 45 stream mi (72 km): 19 stream mi (30 km) of Black River, 5 
stream mi (7 km) of Bear Wallow Creek, 2 stream mi (3 km) of North Fork 
Bear Wallow Creek, 3 stream mi (6 km) of Reservation Creek, 4 stream mi 
(6 km) of Fish Creek, and 12 stream mi (19 km) of East Fork Black 
River. The Black River Subbasin Unit is generally located along the 
Mogollon Rim in east-central Arizona, east of Maverick and west of 
Hannigan Meadow, and includes portions of Apache and Greenlee Counties. 
All lands within this unit are managed by the U.S. Forest Service on 
Apache-Sitgreaves National Forest.
    Unit 5 is designated as critical habitat because it was occupied at 
the time of listing and as a whole, this unit contains PBFs 1, 2, 3, 
and 5, but PBF 4 is in degraded condition. Crayfish, bullfrogs, and 
nonnative, spiny-rayed fish are present in some of this unit, and 
crayfish persist at high densities in the Black River (Lopez 2014d, p. 
4; Nowak and Drost 2015, p. 5; Nowak et al. 2017, p. 8). Water in the 
Black River Subbasin is diverted for use at the Morenci Mine, which may 
affect base flow. Wildfires have burned at both moderate and high 
severity within the unit and have likely resulted in significant 
flooding with excessive ash and sediment loads (Lopez 2014d, p. 5). 
These sediment and ash-laden floods can temporarily reduce populations 
of both nonnative aquatic predatory species and native prey species for 
narrow-headed gartersnakes in affected streams. The PBFs in this unit 
may require special management due to competition with, and predation 
by, nonnative species that are present in this unit; water diversions; 
potential for high-intensity wildfires; and human development of areas 
adjacent to critical habitat.
    We have excluded 195 ac (79 ha) of lands owned by the White 
Mountain Apache and San Carlos Apache Tribes along the Black River, 
Bear Wallow Creek, and Reservation Creek of the Black River Subbasin 
Unit (see Consideration of Impacts under Section 4(b)(2) of the Act, 
below).

Unit 6: Canyon Creek Unit

    Unit 6 consists of 204 ac (82 ha) along 5 stream mi (8 km) of 
Canyon Creek. The Canyon Creek Unit is generally located along the 
Mogollon Rim in east-central Arizona, and falls within Gila County. The 
Tonto National Forest manages all lands within this unit.
    Unit 6 is designated as critical habitat because it was occupied at 
the time of listing and as a whole, this unit contains all PBFs. The 
fish community is primarily native and includes specked dace 
(Rhinichthys osculus), desert sucker (Catostomus clarkii), and brown 
trout (Burger 2015a, p. 4). The PBFs in this unit may require special 
management due to potential invasion by nonnative aquatic predatory 
species as well as the potential for high-intensity wildfires.
    We have excluded 77 ac (31 ha) of lands owned by the White Mountain 
Apache Tribe in the Canyon Creek Unit (see Consideration of Impacts 
under Section 4(b)(2) of the Act, below).

Unit 7: Tonto Creek Subbasin Unit

    Unit 7 consists of a total of 2,293 ac (928 ha) in three subunits 
along 41 stream mi (66 km): 28 stream mi (46 km) of Tonto Creek, 0.7 
stream mi (1.2 km) of Houston Creek, and 12 stream mi (19 km) of 
Haigler Creek. The Tonto Creek Subbasin Unit is generally located 
southeast of Payson, Arizona, and northeast of the Phoenix metropolitan 
area, in Gila County. Land ownership or land management within this 
unit consists of lands managed by the U.S. Forest Service on Tonto 
National Forest in the Hellsgate Wilderness and privately owned lands.
    Unit 7 is designated as critical habitat because it was occupied at 
the time of listing and as a whole, this unit contains PBFs 1, 2, 3, 
and 5, but PBF 4 is in degraded condition. The PBFs in this unit may 
require special management due to competition with, and predation

[[Page 58497]]

by, nonnative species that are present in this unit; water diversions; 
flood-control projects; potential for high-intensity wildfires; and 
development of areas adjacent to or within critical habitat.

Unit 8: Verde River Subbasin Unit

    Unit 8 consists of 3,156 ac (1,277 ha) in three subunits along 58 
stream mi (93 km): 27 stream mi (43 km) of Verde River, 24 stream mi 
(39 km) of Oak Creek, and 7 stream mi (11 km) of West Fork Oak Creek. 
The Verde River Subbasin Unit is generally located near Perkinsville 
and Sedona, Arizona, west of Paulden, Arizona, in Coconino and Yavapai 
Counties. Verde River Subbasin Unit occurs on lands managed by the U.S. 
Forest Service on Prescott and Coconino National Forests, Arizona State 
Parks at Redrock State Park, and private entities.
    Unit 8 is designated as critical habitat because it was occupied at 
the time of listing and as a whole, this unit contains PBFs 1, 2, 3, 
and 5, but PBF 4 is in degraded condition. The PBFs in this unit may 
require special management due to competition with, and predation by, 
nonnative species that are present; water diversions; groundwater 
pumping potentially resulting in drying of habitat; potential for high-
intensity wildfires; and human recreation and human development of 
areas adjacent to critical habitat.

Effects of Critical Habitat Designation

Section 7 Consultation

    Section 7(a)(2) of the Act requires Federal agencies, including the 
Service, to ensure that any action they fund, authorize, or carry out 
is not likely to jeopardize the continued existence of any endangered 
species or threatened species or result in the destruction or adverse 
modification of designated critical habitat of such species.
    We published a final rule revising the definition of destruction or 
adverse modification on August 27, 2019 (84 FR 44976). Destruction or 
adverse modification means a direct or indirect alteration that 
appreciably diminishes the value of critical habitat as a whole for the 
conservation of a listed species.
    If a Federal action may affect a listed species or its critical 
habitat, the responsible Federal agency (action agency) must enter into 
consultation with us. Examples of actions that are subject to the 
section 7 consultation process are actions on State, Tribal, local, or 
private lands that require a Federal permit (such as a permit from the 
U.S. Army Corps of Engineers (Corps) under section 404 of the Clean 
Water Act (33 U.S.C. 1251 et seq.) or a permit from the Service under 
section 10 of the Act) or that involve some other Federal action (such 
as funding from the Federal Highway Administration, Federal Aviation 
Administration, or the Federal Emergency Management Agency). Federal 
actions not affecting listed species or critical habitat--and actions 
on State, Tribal, local, or private lands that are not federally 
funded, authorized, or carried out by a Federal agency--do not require 
section 7 consultation.
    Compliance with the requirements of section 7(a)(2) is documented 
through our issuance of:
    (1) A concurrence letter for Federal actions that may affect, but 
are not likely to adversely affect, listed species or critical habitat; 
or
    (2) A biological opinion for Federal actions that may affect, and 
are likely to adversely affect, listed species or critical habitat.
    When we issue a biological opinion concluding that a project is 
likely to jeopardize the continued existence of a listed species and/or 
destroy or adversely modify critical habitat, we provide reasonable and 
prudent alternatives to the project, if any are identifiable, that 
would avoid the likelihood of jeopardy and/or destruction or adverse 
modification of critical habitat. We define ``reasonable and prudent 
alternatives'' (at 50 CFR 402.02) as alternative actions identified 
during consultation that:
    (1) Can be implemented in a manner consistent with the intended 
purpose of the action,
    (2) Can be implemented consistent with the scope of the Federal 
agency's legal authority and jurisdiction,
    (3) Are economically and technologically feasible, and
    (4) Would, in the Service Director's opinion, avoid the likelihood 
of jeopardizing the continued existence of the listed species and/or 
avoid the likelihood of destroying or adversely modifying critical 
habitat.
    Reasonable and prudent alternatives can vary from slight project 
modifications to extensive redesign or relocation of the project. Costs 
associated with implementing a reasonable and prudent alternative are 
similarly variable.
    Regulations at 50 CFR 402.16 set forth requirements for Federal 
agencies to reinitiate formal consultation on previously reviewed 
actions. These requirements apply when the Federal agency has retained 
discretionary involvement or control over the action (or the agency's 
discretionary involvement or control is authorized by law) and, 
subsequent to the previous consultation: (1) If the amount or extent of 
taking specified in the incidental take statement is exceeded; (2) if 
new information reveals effects of the action that may affect listed 
species or critical habitat in a manner or to an extent not previously 
considered; (3) if the identified action is subsequently modified in a 
manner that causes an effect to the listed species or critical habitat 
that was not considered in the biological opinion; or (4) if a new 
species is listed or critical habitat designated that may be affected 
by the identified action.
    In such situations, Federal agencies sometimes may need to request 
reinitiation of consultation with us, but the regulations also specify 
some exceptions to the requirement to reinitiate consultation on 
specific land management plans after subsequently listing a new species 
or designating new critical habitat. See the regulations for a 
description of those exceptions.

Application of the ``Adverse Modification'' Standard

    The key factor related to the adverse modification determination is 
whether implementation of the proposed Federal action directly or 
indirectly alters the designated critical habitat in a way that 
appreciably diminishes the value of the critical habitat as a whole for 
the conservation of the listed species. As discussed above, the role of 
critical habitat is to support physical or biological features 
essential to the conservation of a listed species and provide for the 
conservation of the species.
    Section 4(b)(8) of the Act requires us to briefly evaluate and 
describe, in any proposed or final regulation that designates critical 
habitat, activities involving a Federal action that may violate section 
7(a)(2) of the Act by destroying or adversely modifying such habitat, 
or that may be affected by such designation.
    Activities that may affect critical habitat, when carried out, 
funded, or authorized by a Federal agency, should result in 
consultation for the narrow-headed gartersnake. Some of these 
activities may have short-term negative effects to designated critical 
habitat but may also result in long-term benefits to the gartersnake.
    These activities include, but are not limited to:
    (1) Actions that would alter the amount, timing, or frequency of 
flow within a stream or the quantity of available water within aquatic 
or wetland habitat such that the prey base for the narrow-headed 
gartersnake, or the gartersnake itself, are appreciably

[[Page 58498]]

diminished or threatened with extirpation. Such activities could 
include, but are not limited to: Water diversions; channelization; 
construction of any barriers or impediments within the active river 
channel; removal of flows in excess of those allotted under a given 
water right; construction of permanent or temporary diversion 
structures; groundwater pumping within aquifers associated with the 
river; or dewatering of isolated within-channel pools or stock tanks. 
These activities could result in the reduction of the distribution or 
abundance of important gartersnake prey species, as well as reduce the 
distribution and amount of suitable physical habitat on a regional 
landscape for the gartersnake itself.
    (2) Actions that would significantly increase sediment deposition 
or scouring within the stream channel or pond that is habitat for the 
narrow-headed gartersnake, or one or more of their prey species within 
the range of the narrow-headed gartersnake. Such activities could 
include, but are not limited to: Livestock grazing that results in 
erosion contaminating waters; road construction; commercial or urban 
development; channel alteration; timber harvest; prescribed fires or 
wildfire suppression; off-road vehicle or recreational use; and other 
alterations of watersheds and floodplains. These activities could 
adversely affect the potential for gartersnake prey species to survive 
or breed. They may also reduce the likelihood that the gartersnake's 
prey species (i.e., native fish) could move among subpopulations in a 
functioning metapopulation. This would, in turn, decrease the viability 
of metapopulations and their component local populations of prey 
species.
    (3) Actions that would alter water chemistry beyond the tolerance 
limits of a gartersnake prey base. Such activities could include, but 
are not limited to: Release of chemicals, biological pollutants, or 
effluents into the surface water or into connected groundwater at a 
point source or by dispersed release (non-point source); aerial 
deposition of known toxicants, such as mercury, that are positively 
correlated to regional exceedances of water quality standards for these 
toxicants; livestock grazing that results in waters heavily polluted by 
feces; runoff from agricultural fields; roadside use of salts; aerial 
pesticide overspray; runoff from mine tailings or other mining 
activities; and ash flow and fire retardants from fires and fire 
suppression. These actions could adversely affect the ability of the 
habitat to support survival and reproduction of gartersnake prey 
species.
    (4) Actions that would remove, diminish, or significantly alter the 
structural complexity of key natural structural habitat features in and 
adjacent to aquatic habitat. These features may be organic or 
inorganic, may be natural or constructed, and include (but are not 
limited to) boulders and boulder piles, cliff faces, rocks such as 
river cobble, downed trees or logs, debris jams, small mammal burrows, 
or leaf litter. Such activities could include, but are not limited to: 
Construction projects; flood control projects; vegetation management 
projects; or any project that requires a 404 permit from the U.S. Army 
Corps of Engineers. These activities could result in a reduction of the 
amount or distribution of these key habitat features that are important 
for gartersnake thermoregulation, shelter, protection from predators, 
and foraging opportunities.
    (5) Actions and structures that would physically block movement of 
gartersnakes or their prey species within or between regionally 
proximal populations or suitable habitat. Such actions and structures 
include, but are not limited to: Urban, industrial, or agricultural 
development; reservoirs stocked with predatory fishes, bullfrogs, or 
crayfish; highways that do not include reptile and amphibian fencing 
and culverts; and walls, dams, fences, canals, or other structures that 
could physically block movement of gartersnakes. These actions and 
structures could reduce or eliminate immigration and emigration among 
gartersnake populations, or that of their prey species, reducing the 
long-term viability of populations.
    (6) Actions that would directly or indirectly result in the 
introduction, spread, or augmentation of predatory nonnative species in 
gartersnake habitat, or in habitat that is hydrologically connected, 
even if those segments are occasionally intermittent, or introduction 
of other species that compete with or prey on the narrow-headed 
gartersnake or its prey base, or introduce pathogens. Possible actions 
could include, but are not limited to: Introducing or stocking 
nonnative, spiny-rayed fishes, bullfrogs, crayfish, or other predators 
of the prey base of narrow-headed gartersnakes; creating or sustaining 
a sport fishery that encourages use of nonnative live fish or crayfish 
as bait; maintaining or operating reservoirs that act as source 
populations for predatory nonnative species within a watershed; 
constructing water diversions, canals, or other water conveyances that 
move water from one place to another and through which inadvertent 
transport of predatory nonnative species into narrow-headed gartersnake 
habitat may occur; and moving water, mud, wet equipment, or vehicles 
from one aquatic site to another, through which inadvertent transport 
of pathogens may occur. These activities directly or indirectly cause 
unnatural competition with and predation from nonnative aquatic 
predators on the narrow-headed gartersnake, leading to reduced 
recruitment within gartersnake populations and diminishment or 
extirpation of their prey base.
    (7) Actions that would deliberately remove, diminish, or 
significantly alter the native or nonnative, soft-rayed fish component 
of the narrow-headed gartersnake prey base within occupied habitat. In 
general, these actions typically occur in association with fisheries 
management, such as the application of piscicides in conjunction with 
fish barrier construction.

Exemptions

Application of Section 4(a)(3) of the Act

    Section 4(a)(3)(B)(i) of the Act (16 U.S.C. 1533(a)(3)(B)(i)) 
provides that the Secretary shall not designate as critical habitat any 
lands or other geographical areas owned or controlled by the Department 
of Defense, or designated for its use, that are subject to an 
integrated natural resources management plan (INRMP) prepared under 
section 101 of the Sikes Act (16 U.S.C. 670a), if the Secretary 
determines in writing that such plan provides a benefit to the species 
for which critical habitat is proposed for designation. There are no 
Department of Defense (DoD) lands with a completed INRMP within the 
final critical habitat designation.

Consideration of Impacts and Exclusions Under Section 4(b)(2) of the 
Act

    Section 4(b)(2) of the Act states that the Secretary shall 
designate and make revisions to critical habitat on the basis of the 
best available scientific data after taking into consideration the 
economic impact, national security impact, and any other relevant 
impact of specifying any particular area as critical habitat. The 
Secretary may exclude an area from critical habitat if we determine 
that the benefits of such exclusion outweigh the benefits of specifying 
such area as part of the critical habitat, unless we determine, based 
on the best scientific data available, that the failure to designate 
such area as critical habitat will result in the extinction of the 
species. In making the determination to

[[Page 58499]]

exclude a particular area, the statute on its face, as well as the 
legislative history, are clear that the Secretary has broad discretion 
regarding which factor(s) to use and how much weight to give to any 
factor.
    On December 18, 2020, we published a final rule in the Federal 
Register (85 FR 82376) revising portions of our regulations concerning 
excluding areas of critical habitat under section 4(b)(2) of the Act. 
These final regulations became effective on January 19, 2021, and apply 
to critical habitat rules for which a proposed rule was published after 
January 19, 2021. Consequently, these new regulations do not apply to 
this final rule.
    Under section 4(b)(2) of the Act, we may exclude an area from 
designated critical habitat based on economic impacts, impacts on 
national security, or any other relevant impacts. In considering 
whether to exclude a particular area from the designation, we identify 
the benefits of including the area in the designation, identify the 
benefits of excluding the area from the designation, and evaluate 
whether the benefits of exclusion outweigh the benefits of inclusion. 
If the analysis indicates that the benefits of exclusion outweigh the 
benefits of inclusion, the Secretary may exercise discretion to exclude 
the area only if such exclusion would not result in the extinction of 
the species. We describe below the process that we undertook for taking 
into consideration each category of impacts and our analyses of the 
relevant impacts.
    As discussed below, based on the information provided by entities 
seeking exclusion, as well as any additional public comments received, 
we evaluated whether certain lands in the proposed critical habitat 
were appropriate for exclusion from this final designation pursuant to 
section 4(b)(2) of the Act. The Act affords a great degree of 
discretion to the Service in implementing section 4(b)(2). This 
discretion is applicable to a number of aspects of section 4(b)(2) 
including whether to enter into the discretionary 4(b)(2) exclusion 
analysis and the weights assigned to any particular factor used in the 
analysis. Most significant is that the decision to exclude is always 
discretionary, as the Act states that the Secretary ``may'' exclude any 
areas. Under no circumstances is exclusion required under the second 
sentence of section 4(b)(2). There is no requirement to exclude, or 
even to enter into a discretionary 4(b)(2) exclusion analysis for any 
particular area identified as critical habitat. Accordingly, per our 
discretion, we have only done a full discretionary exclusion analysis 
when we received clearly articulated and reasoned rationale to exclude 
the area from this critical habitat designation.

Consideration of Economic Impacts

    Section 4(b)(2) of the Act and its implementing regulations require 
that we consider the economic impact that may result from a designation 
of critical habitat. In order to consider economic impacts, we prepared 
an incremental effects memorandum (IEM) and screening analysis which, 
together with our narrative and interpretation of effects, we consider 
our draft economic analysis (DEA) of the critical habitat designation 
and related factors (IEc 2019, entire). The analysis, dated October 10, 
2019, was made available for public review from April 28, 2020, through 
June 29, 2020 (see 85 FR 23608; April 28, 2020). The DEA addressed 
probable economic impacts of critical habitat designation for the 
narrow-headed gartersnake. Following the close of the comment period, 
we reviewed and evaluated all information submitted during the comment 
period that may pertain to our consideration of the probable 
incremental economic impacts of this critical habitat designation. The 
DEA was updated in March 2021 to reflect changes made to critical 
habitat units from the revised proposed rule; however, the total 
incremental costs are not expected to change (IEc 2021, entire). 
Additional information relevant to the probable incremental economic 
impacts of the critical habitat designation for the narrow-headed 
gartersnake is summarized below and available in the screening analysis 
for the narrow-headed gartersnake (IEc 2021, entire), available at 
http://www.regulations.gov.
    In our IEM, we attempted to clarify the distinction between the 
effects that will result from the species being listed and those 
attributable to the critical habitat designation (i.e., difference 
between the jeopardy and adverse modification standards) for the 
narrow-headed gartersnake's critical habitat. The following specific 
circumstances help to inform our evaluation: (1) The essential PBFs 
identified for critical habitat are the same features essential for the 
life requisites of the species; and (2) any actions that would result 
in sufficient harm or harassment to constitute jeopardy to the narrow-
headed gartersnake would also likely adversely affect the essential 
PBFs of critical habitat. The IEM outlines our rationale concerning 
this limited distinction between baseline conservation efforts and 
incremental impacts of the designation of critical habitat for this 
species. This evaluation of the incremental effects has been used as 
the basis to evaluate the probable incremental economic impacts of this 
designation of critical habitat.
    The critical habitat designation for the narrow-headed gartersnake 
totals 23,784 ac (9,625 ha) comprising eight units. Land ownership 
within critical habitat for the narrow-headed gartersnake in acres is 
broken down as follows: Federal (74 percent), State (Arizona and New 
Mexico) (3 percent), and private (23 percent) (see Table 1, above). All 
units are occupied.
    In these areas, any actions that may affect the species would also 
affect designated critical habitat because the species is so dependent 
on habitat to fulfill its life-history functions. Therefore, any 
conservation measures to address impacts to the species would be the 
same as those to address impacts to critical habitat. Consequently, it 
is unlikely that any additional conservation efforts would be 
recommended to address the adverse modification standard over and above 
those recommended as necessary to avoid jeopardizing the continued 
existence of the narrow-headed gartersnake. Further, every unit of 
critical habitat overlaps with the ranges of a number of currently 
listed species and designated critical habitats. Therefore, the actual 
number of section 7 consultations is not expected to increase. The 
consultation would simply have to consider an additional species or 
critical habitat unit. While this additional analysis will require time 
and resources by the Federal action agency, the Service, and third 
parties, the probable incremental economic impacts of the critical 
habitat designation are expected to be limited to additional 
administrative costs and would not be significant (IEc 2021, entire). 
This is due to all units being occupied by the narrow-headed 
gartersnake.
    Based on consultation history for the gartersnake, the number of 
future consultations, including technical assistances, is likely to be 
no more than 21 per year. The additional administrative cost of 
addressing adverse modification in these consultations is likely to be 
less than $61,000 in a given year, including costs to the Service, the 
Federal action agency, and third parties (IEc 2021, p. 14), with 
approximately $28,000 for formal consultations, $32,000 for informal 
consultations, and $1,100 for technical assistances. This is based on 
an individual technical assistance costing $410, informal consultation 
costing $2,500, and formal consultation

[[Page 58500]]

costing $9,600. Therefore, the incremental costs associated with 
critical habitat are unlikely to exceed $100 million in any single year 
and, therefore, would not be significant (see Executive Order (E.O.) 
12866 Regulatory Planning and Review).

Exclusions Based on Economic Impacts

    The Service considered the economic impacts of the critical habitat 
designation. We are not exercising our discretion to exclude any areas 
from this designation of critical habitat for the narrow-headed 
gartersnake based on economic impacts.

Consideration of Impacts on National Security and Homeland Security

    Section 4(a)(3)(B)(i) of the Act may not cover all DoD lands or 
areas that pose potential national-security concerns (e.g., a DoD 
installation that is in the process of revising its INRMP for a newly 
listed species or a species previously not covered). If a particular 
area is not covered under section 4(a)(3)(B)(i), then national-security 
or homeland-security concerns are not a factor in the process of 
determining what areas meet the definition of ``critical habitat.'' 
However, the Service must still consider impacts on national security, 
including homeland security, on those lands or areas not covered by 
section 4(a)(3)(B)(i), because section 4(b)(2) requires the Service to 
consider those impacts whenever it designates critical habitat. 
Accordingly, if DoD, Department of Homeland Security (DHS), or another 
Federal agency has requested exclusion based on an assertion of 
national-security or homeland-security concerns, or we have otherwise 
identified national-security or homeland-security impacts from 
designating particular areas as critical habitat, we generally have 
reason to consider excluding those areas.
    However, we cannot automatically exclude requested areas. When DoD, 
DHS, or another Federal agency requests exclusion from critical habitat 
on the basis of national-security or homeland-security impacts, it must 
provide a reasonably specific justification of an incremental impact on 
national security that would result from the designation of that 
specific area as critical habitat. That justification could include 
demonstration of probable impacts, such as impacts to ongoing border-
security patrols and surveillance activities, or a delay in training or 
facility construction, as a result of compliance with section 7(a)(2) 
of the Act. If the agency requesting the exclusion does not provide us 
with a reasonably specific justification, we will contact the agency to 
recommend that it provide a specific justification or clarification of 
its concerns relative to the probable incremental impact that could 
result from the designation. If we conduct an exclusion analysis 
because the agency provides a reasonably specific justification or 
because we decide to exercise the discretion to conduct an exclusion 
analysis, we will defer to the expert judgment of DoD, DHS, or another 
Federal agency as to: (1) Whether activities on its lands or waters, or 
its activities on other lands or waters, have national-security or 
homeland-security implications; (2) the importance of those 
implications; and (3) the degree to which the cited implications would 
be adversely affected in the absence of an exclusion. In that 
circumstance, in conducting a discretionary section 4(b)(2) exclusion 
analysis, we will give great weight to national-security and homeland-
security concerns in analyzing the benefits of exclusion.

Exclusions Based on Impacts on National Security and Homeland Security

    We have determined that the lands within the designation of 
critical habitat for the narrow-headed gartersnake are not owned or 
managed by DoD or DHS. We did not receive any requests for exclusion 
based on impacts to national security or homeland security. Therefore, 
we anticipate no impact on national security or homeland security, and 
we are not exercising our discretion to exclude any lands based on 
impacts to national security or homeland security.

Consideration of Other Relevant Impacts

    Under section 4(b)(2) of the Act, we consider any other relevant 
impacts, in addition to economic impacts and impacts on national 
security discussed above. Other relevant impacts may include, but are 
not limited to, impacts to Tribes, States, local governments, public 
health and safety, community interests, the environment (such as 
increased risk of wildfire or pest and invasive species management), 
Federal lands, and conservation plans, agreements, or partnerships. To 
identify other relevant impacts that may affect the exclusion analysis, 
we consider a number of factors, including whether there are permitted 
conservation plans covering the species in the area--such as HCPs, safe 
harbor agreements (SHAs), or candidate conservation agreements with 
assurances (CCAAs)--or whether there are non-permitted conservation 
agreements and partnerships that may be impaired by designation of, or 
exclusion from, critical habitat. In addition, we look at whether 
Tribal conservation plans or partnerships, Tribal resources, or 
government-to-government relationships of the United States with Tribal 
entities may be affected by the designation. We also consider any 
State, local, public-health, community-interest, environmental, or 
social impacts that might occur because of the designation.
    When analyzing other relevant impacts of including a particular 
area in a designation of critical habitat, we weigh those impacts 
relative to the conservation value of the particular area. To determine 
the conservation value of designating a particular area, we consider a 
number of factors, including, but not limited to, the additional 
regulatory benefits that the area would receive due to the protection 
from destruction or adverse modification as a result of actions with a 
Federal nexus, the educational benefits of mapping essential habitat 
for recovery of the listed species, and any benefits that may result 
from a designation due to State or Federal laws that may apply to 
critical habitat.
    In the case of the narrow-headed gartersnake, the benefits of 
critical habitat include public awareness of the presence of the 
species and the importance of habitat protection, and, where a Federal 
nexus exists, increased habitat protection for the gartersnake due to 
the protection from destruction or adverse modification of critical 
habitat. Continued implementation of an ongoing management plan that 
provides conservation equal to or more than the protections that result 
from a critical habitat designation would reduce those benefits of 
including that specific area in the critical habitat designation.

Exclusions Based on Other Relevant Impacts

    Based on the information provided by entities seeking exclusion, 
any additional public comments we received, and the best scientific 
data available, we evaluated whether certain lands in the critical 
habitat were appropriate for exclusion from this final designation 
under section 4(b)(2) of the Act. If the analysis indicated that the 
benefits of excluding lands from the final designation outweigh the 
benefits of designating those lands as critical habitat, then we 
identified those areas for the Secretary to exercise her discretion to 
exclude the lands from the final designation, unless exclusion would 
result in extinction.

[[Page 58501]]

    In the paragraphs below, we provide a detailed balancing analysis 
of the areas we evaluated for exclusion from critical habitat under 
section 4(b)(2) of the Act.

Private or Other Non-Federal Conservation Plans or Agreements and 
Partnerships, in General

    We sometimes exclude specific areas from critical habitat 
designations based in part on the existence of private or other non-
Federal conservation plans or agreements and their attendant 
partnerships. A conservation plan or agreement describes actions that 
are designed to provide for the conservation needs of a species and its 
habitat, and may include actions to reduce or mitigate negative effects 
on the species caused by activities on or adjacent to the area covered 
by the plan. Conservation plans or agreements can be developed by 
private entities with no Service involvement, or in partnership with 
the Service, sometimes through the permitting process under Section 10 
of the Act.
    When we undertake a discretionary section 4(b)(2) analysis, we 
evaluate a variety of factors to determine how the benefits of any 
exclusion and the benefits of inclusion are affected by the existence 
of private or other non-Federal conservation plans or agreements and 
their attendant partnerships when we undertake a discretionary section 
4(b)(2) exclusion analysis. A non-exhaustive list of factors that we 
will consider for non-permitted plans or agreements is shown below (see 
Policy Regarding Implementation of Section 4(b)(2) of the Endangered 
Species Act (81 FR 7226; February 11, 2016)). These factors are not 
required elements of plans or agreements, and all items may not apply 
to every plan or agreement.
    (i) The degree to which the plan or agreement provides for the 
conservation of the species or the essential physical or biological 
features (if present) for the species.
    (ii) Whether there is a reasonable expectation that the 
conservation management strategies and actions contained in a 
management plan or agreement will be implemented.
    (iii) The demonstrated implementation and success of the chosen 
conservation measures.
    (iv) The degree to which the record of the plan supports a 
conclusion that a critical habitat designation would impair the 
realization of benefits expected from the plan, agreement, or 
partnership.
    (v) The extent of public participation in the development of the 
conservation plan.
    (vi) The degree to which there has been agency review and required 
determinations (e.g., State regulatory requirements), as necessary and 
appropriate.
    (vii) Whether NEPA compliance was required.
    (viii) Whether the plan or agreement contains a monitoring program 
and adaptive management to ensure that the conservation measures are 
effective and can be modified in the future in response to new 
information.
Non-Permitted Conservation Plans, Agreements, or Partnerships
I. Gila River Subunit Within the Upper Gila River Subbasin Unit--
Freeport-McMoRan Management Plan
    Critical habitat for gartersnakes was identified for the Gila River 
(563 ac (228 ha)) on Freeport-McMoRan privately owned lands where the 
narrow-headed gartersnake occurs.
    FMC completed their Spikedace and Loach Minnow Management Plan for 
the Upper Gila River (FMC management plan), including Bear Creek and 
Mangas Creek in Grant County, New Mexico, in 2011. The FMC management 
plan was created in response to a proposed rule to designate critical 
habitat for the spikedace and loach minnow along reaches of the Gila 
River, Mangas Creek, and Bear Creek (75 FR 66482; October 28, 2010) 
owned by FMC. Water rights are also included in these land holdings. 
The majority of these lands are owned by Pacific Western Land Company 
(PWLC) and included the U-Bar Ranch, which has been managed under a 
rest-rotation livestock grazing strategy since approximately 1992. The 
focus of management actions pertaining to spikedace and loach minnow 
occur along the middle section of the upper Gila River, the perennial 
portion of Mangas Creek, and lower portion of Bear Creek near the 
village of Gila within the Gila-Cliff Valley of New Mexico. 
Collectively and through existing water diversions, these lands and 
associated water rights support mining operations at the Tyrone Mine as 
well as livestock operations along the Gila River.
    Livestock operations within the U-Bar Ranch consider the needs of 
the southwestern willow flycatcher and are considered to provide 
indirect benefits to spikedace and loach minnow under the FMC 
management plan. For the purposes of this analysis, we reviewed the 
commitments made in the FMC management plan that pertain to spikedace 
and loach minnow, not the southwestern willow flycatcher, due to their 
ecological needs, which more closely overlap those of the narrow-headed 
gartersnake. In the past, FMC has funded fish surveys within the U-Bar 
Ranch along the Gila River, as well as Mangas and Bear Creeks. The FMC 
management plan established a framework for cooperation and 
coordination with the Service in connection with future resource 
management activities based on adaptive management principles. FMC 
lands are closed to public use, which eliminates potential concerns for 
effects to riparian and streambed habitat from off-highway vehicle use, 
camping, and hiking. Access to FMC lands are provided for wildlife 
survey needs.
    The FMC management plan also commits to maintaining base flow in 
the Gila River within its planning area, through a cessation of water 
diversions at the Bill Evans Reservoir diversion, provided two 
conditions are met: (1) The Gila River is flowing at less than 25 cubic 
feet per second (cfs) per day at USGS Gage 09431500, near Redrock, New 
Mexico (the nearest gage downstream from FMC's point of diversion); and 
(2) the water level in Bill Evans Reservoir is at least 4,672 ft above 
sea level. In the event that the first condition is satisfied but the 
reservoir level is below 4,672 ft above sea level, FMC will confer with 
NMDGF (which owns Bill Evans Reservoir) regarding temporary curtailment 
of water diversions. Therefore, maintaining minimum flow in the Gila 
River is not under the sole discretion of FMC. In the event water use 
changes become necessary, FMC provides us with notice of any 
significant changes in its water uses and diversions and will confer 
about impacts of such changes on spikedace and loach minnow habitat.
    FMC has also committed to funding biennial fish surveys and the 
maintenance of survey locations, fisheries biologists, techniques, and 
protocols along the lands associated with the Gila River and to 
providing subsequent data to us. Lastly, FMC committed to make 
reasonable efforts to coordinate and encourage adjacent landowners, as 
well as confer with us on opportunities to increase local public 
awareness, to assist in their conservation management and, when 
appropriate, assist other landowners to these ends. The FMC management 
plan considers adaptive management, which includes, if necessary, the 
development of alternative conservation measures at a total cost of 
$500,000, for habitat protection. Summarized, the FMC management plan 
commits to ongoing grazing using rest-rotation at moderate levels, the 
prohibition of public trespass unless for the purposes of surveys and

[[Page 58502]]

monitoring for covered species (the narrow-headed gartersnake is not 
covered), limiting water diversion withdrawals from the Gila River 
provided certain criteria are met (dependent upon discretion of a third 
party), and a commitment to make reasonable efforts to coordinate with 
other landowners in the area on voluntary implementation of 
conservation measures.

Benefits of Inclusion--FMC Management Plan

    As discussed above under Effects of Critical Habitat Designation, 
Section 7 Consultation, Federal agencies, in consultation with the 
Service, must ensure that their actions are not likely to jeopardize 
the continued existence of any listed species or result in the 
destruction or adverse modification of any designated critical habitat 
of such species. The difference in the outcomes of the jeopardy 
analysis and the adverse modification analysis represents the 
regulatory benefit and costs of critical habitat. It is possible that 
in the future, Federal funding or permitting could occur on this 
privately owned land where a critical habitat designation may benefit 
narrow-headed gartersnake habitat. The implementation of potential 
conservation measures or conservation recommendations could provide 
important benefits to the continued conservation and recovery of the 
species in this area.
    Because the narrow-headed gartersnake occurs in this area, the 
benefits of a critical habitat designation are reduced to the possible 
incremental benefit of critical habitat because the designation would 
not be the sole catalyst for initiating section 7 consultation. 
However, should a catastrophic event such as disease, drought, 
wildfire, chemical spill, etc., result in potential or actual 
extirpation of the gartersnake population in this area, designation of 
critical habitat will ensure future Federal actions do not result in 
adverse modification of critical habitat, allowing for future recovery 
actions to occur.
    Another important benefit of including lands in a critical habitat 
designation is that it can serve to educate landowners, agencies, 
Tribes, and the public regarding the potential conservation value of an 
area, and may help focus conservation efforts on areas of high value 
for certain species. Any information about the narrow-headed 
gartersnake that reaches a wide audience, including parties engaged in 
conservation activities, is valuable. The designation of critical 
habitat may also affect the implementation of Federal laws, such as the 
Clean Water Act. These laws analyze the potential for projects to 
significantly affect the environment. Critical habitat may signal the 
presence of important sensitive habitat that could otherwise be missed 
in the review process for these other environmental laws.
    Despite its benefits to the spikedace and loach minnow, the FMC 
management plan does not provide adequate conservation of the narrow-
headed gartersnake because:
     The management plan does not commit to any conservation 
measures that directly address the leading threat facing the narrow-
headed gartersnake across its range: The presence of predatory 
nonnative aquatic species.
     Within the FMC management plan area, livestock have 
sustained access to the riparian corridor, which negatively impacts 
narrow-headed gartersnakes because gartersnakes require adequate cover 
for protection from predators and to assist with thermoregulation.
     The decision to change the amount of diverted Gila River 
water in the event of flows reaching 25 cfs or below are contingent 
upon an external entity to the FMC management plan and their desires 
for management of the Bill Evans Reservoir, adding uncertainty to this 
measure in terms of its implementation.
     Benefits of an unquantifiable and therefore unknown effort 
associated with enhancing cooperative conservation with adjacent 
landowners yields high uncertainty pertaining to both implementation of 
the measure and potential benefits realized by its implementation.

Benefits of Exclusion--FMC Management Plan

    One benefit from excluding FMC-owned lands as narrow-headed 
gartersnake critical habitat is the maintenance and strengthening of 
ongoing conservation partnerships. FMC has demonstrated a willingness 
to partner with the Service in conservation planning for several 
species in Arizona and New Mexico. Examples include becoming a 
conservation partner in the development and implementation of the 
Southwestern Willow Flycatcher Recovery Plan, and by solidifying their 
conservation actions in management plans submitted to us for the 
southwestern willow flycatcher, and for the spikedace and loach minnow 
(2007 and 2011). They have also demonstrated a willingness to conserve 
southwestern willow flycatcher and western yellow-billed cuckoo 
(Coccyzus americanus) habitat at Pinal Creek and to partner with us by 
exploring the initial stages of a habitat conservation plan.
    Our collaborative relationship with FMC in the conservation arena 
makes a difference in our partnership with the numerous stakeholders 
involved in aquatic species recovery and management and influences our 
ability to form partnerships with others. Concerns over perceived, 
added regulation potentially imposed by critical habitat could harm 
this collaborative relationship.
    Because important areas for gartersnake conservation can occur on 
private lands, collaborative relationships with private landowners can 
be important in order to further recovery. The narrow-headed 
gartersnake and its habitat could benefit in some cases, from voluntary 
landowner management actions that implement appropriate and effective 
conservation strategies. Where consistent with the discretion provided 
by the Act, it is beneficial to implement policies that provide 
positive incentives to private landowners to voluntarily conserve 
natural resources and that remove or reduce disincentives to 
conservation (Wilcove et al. 1996, pp. 1-15; Bean 2002, pp. 1-7). Thus, 
it is important for narrow-headed gartersnake conservation to seek out 
continued conservation partnerships such as these with a proven 
partner, and to provide positive incentives for other private 
landowners who might be considering implementing voluntary conservation 
activities, but who have concerns about incurring incidental regulatory 
or economic impacts should a Federal nexus occur.

Benefits of Inclusion Outweigh the Benefits of Exclusion--FMC 
Management Plan

    We have determined that the benefits of inclusion of the Gila River 
on private lands managed by FMC outweigh the benefits of exclusion 
based on several factors. Above, we outlined several instances where 
management actions set forth in the plan either do not pertain directly 
to the needs of narrow-headed gartersnake critical habitat, do not have 
the necessary assurances that beneficial actions will indeed occur, or 
provide minimal benefits to gartersnake conservation and recovery in 
general. However, we will continue to work with FMC in the conservation 
arena as they are an important partner of the Service in conservation 
planning for several species in Arizona and New Mexico.
    After weighing the benefits of inclusion as narrow-headed 
gartersnake critical habitat against the benefits of exclusion, we have 
concluded that the

[[Page 58503]]

benefits of including FMC privately owned lands on the Gila River (563 
ac (228 ha)) outweigh those that would result from excluding these 
areas from critical habitat designation. Therefore, we did not exclude 
these lands from the final designation.
II. Whitewater Creek Subunit--NMDGF's Glenwood State Fish Hatchery 
Management
    Critical habitat for the narrow-headed gartersnake was identified 
for Whitewater Creek that includes 2.9 ac (1.2 ha) of lands that are 
part of the Glenwood State Fish Hatchery owned by NMDGF. NMDGF 
established the Glenwood State Fish Hatchery adjacent to Whitewater 
Creek in 1938. The hatchery currently raises female sterile rainbow 
trout (Oncorhynchus mykiss) and a renovation to the facility to 
propagate Gila trout (O. gilae) is planned. The portion of Whitewater 
Creek that flows through the hatchery property is considered dispersal 
habitat for narrow-headed gartersnakes moving between the Catwalk 
Recreation Area upstream of the hatchery to the San Francisco River.
    We received a comment from NMDGF requesting that this area within 
the Glenwood State Fish Hatchery be excluded from the final designation 
of critical habitat. NMDGF's rationale for requesting exclusion was 
that there are no records of the species within the hatchery boundary 
and Whitewater Creek is not perennial at the hatchery. NMDGF further 
explains that the Service's Memorandum for the Intra-Service Section 7 
Endangered Species Act Consultation for the Proposed Operation and 
Maintenance of Hatchery Facilities NM F-66 Project concurred with a 
``no effect'' determination for the narrow-headed gartersnake because 
the snake is not currently present.
    In the revised proposed critical habitat rule (85 FR 23608; April 
28, 2020), we reviewed narrow-headed gartersnake occupancy to determine 
that a stream or stream reach was occupied at the time of listing for 
narrow-headed gartersnake if it is within the historical range of the 
species, contains PBFs for the species (although the PBFs concerning 
prey availability and presence of nonnative aquatic predators are often 
in degraded condition), and has a last known record of occupancy 
between 1998 and 2019 (see Occupancy Records, 85 FR 23608, p. 23617-
23619) (see Criteria Used To Identify Critical Habitat). Although 
narrow-headed gartersnakes have not been detected at the hatchery, the 
segment of Whitewater Creek included in the critical habitat 
designation for the narrow-headed gartersnake, including where the 
creek flows through the hatchery, meets this definition.
    In the revised proposed critical habitat rule (85 FR 23608; April 
28, 2020) and this rule, we also define perennial, intermittent, and 
ephemeral as related to stream flow included in PBF 1 for the narrow-
headed gartersnake and clarify the spectrum of stream flow regimes that 
provide stream habitat for the species based on scientifically accepted 
stream flow definitions (Levick et al. 2008, p. 6; Stromberg et al. 
2009, p. 330) (see ``Stream Flow'' in 85 FR 23608, April 28, 2020, p. 
23613; see also Physical or Biological Features Essential to the 
Conservation of the Species, below). Although Whitewater Creek is 
ephemeral at the Glenwood State Fish Hatchery, it is perennial upstream 
of the hatchery and downstream at its confluence with the San Francisco 
River, so the entire stream segment meets our definition of critical 
habitat.
    In regard to NMDGF's assertion that the hatchery should not be 
listed as critical habitat because of the Service's previous 
concurrence with a ``no effect'' determination under a Section 7 Intra-
Service consultation, a critical habitat determination is not 
synonymous with a determination that an area is occupied for the 
purposes of a jeopardy analysis under Section 10 of the Act. Under 
section 7 of the Act, Federal agencies are required to consult with the 
Service to ensure that the actions they carry out, fund, or authorize 
are not likely to jeopardize the continued existence of the species, or 
destroy or adversely modify critical habitat. For a jeopardy or 
``take'' analysis, we analyze effects to a species if the species is 
present in the action area during the time of the action. For an 
adverse modification analysis, we analyze effects to critical habitat 
if critical habitat for a species is present in the action area. 
Therefore, an effect determination is different than a critical habitat 
designation. A critical habitat determination depends on the best 
available information at the time of the analysis, and the likely 
effects and likelihood of take depend on the action under 
consideration. NMDGF does not have a management plan for the narrow-
headed gartersnake at the hatchery, but has stated that if a population 
became established at the hatchery in the future, they would implement 
conservation actions such as identifying and protecting hibernacula, 
foraging sites, and corridors within the limits of hatchery operations; 
maintaining or improving existing habitat for the species; and 
conducting regular monitoring of the population (NMDGF 2020, p. 1). 
Regardless of the absence of narrow-headed gartersnake on a very small 
portion of Whitewater Creek in the hatchery boundary, as discussed 
above, Whitewater Creek, including the hatchery property, meets the 
Service's definition of critical habitat. There are no current 
management actions set forth that pertain directly to the needs of 
narrow-headed gartersnake critical habitat, and without a plan we lack 
the necessary assurances that beneficial actions will occur. We are 
committed to working with the NMDGF to further narrow-headed 
gartersnake conservation, and we expect the continuation of our 
conservation partnership help foster the maintenance and development of 
narrow-headed gartersnake habitat in the vicinity of the Glenwood State 
Fish Hatchery.
    Under section 4(b)(2) of the Act, we can exclude specific areas 
from critical habitat designations based in part on the existence of 
private or other non-Federal conservation plans or agreements and their 
attendant partnerships. A conservation plan or agreement describes 
actions that are designed to provide for the conservation needs of a 
species and its habitat, and may include actions to reduce or mitigate 
negative effects on the species caused by activities on or adjacent to 
the area covered by the plan. However, there are no current management 
actions set forth that pertain directly to the needs of narrow-headed 
gartersnake critical habitat.
    With respect to NMDGF's request to exclude the Glenwood State Fish 
Hatchery along Whitewater Creek, we are not excluding the area from 
this final rule for the reasons mentioned above. NMDGF has demonstrated 
a willingness to partner with the Service in conservation planning for 
several species in New Mexico, including recovery actions for listed 
fish species that occur in the Gila River subbasin. Our collaborative 
relationship with NMDGF in the conservation arena makes a difference in 
our partnership with the numerous stakeholders involved in aquatic 
species recovery and management, and influences our ability to form 
partnerships with others, and we will continue to collaborate on 
conservation efforts now and into the future.

Private or Other Non-Federal Conservation Plans Related to Permits 
Under Section 10 of the Act

    HCPs for incidental take permits under section 10(a)(1)(B) of the 
Act provide for partnerships with non-Federal entities to minimize and 
mitigate impacts to listed species and

[[Page 58504]]

their habitat. In some cases, HCP permittees agree to do more for the 
conservation of the species and their habitats on private lands than 
designation of critical habitat would provide alone. We place great 
value on the partnerships that are developed during the preparation and 
implementation of HCPs.
    CCAAs and SHAs are voluntary agreements designed to conserve 
candidate and listed species, respectively, on non-Federal lands. In 
exchange for actions that contribute to the conservation of species on 
non-Federal lands, participating property owners are covered by an 
``enhancement of survival'' permit under section 10(a)(1)(A) of the 
Act, which authorizes incidental take of the covered species that may 
result from implementation of conservation actions, specific land uses, 
and, in the case of SHAs, the option to return to a baseline condition 
under the agreements. The Service also provides enrollees assurances 
that we will not impose further land-, water-, or resource-use 
restrictions, or require additional commitments of land, water, or 
finances, beyond those agreed to in the agreements.
    When we undertake a discretionary section 4(b)(2) exclusion 
analysis based on permitted conservation plans such as CCAAs, SHAs, and 
HCPs, we consider the following three factors:
    (i) Whether the permittee is properly implementing the conservation 
plan or agreement;
    (ii) Whether the species for which critical habitat is being 
designated is a covered species in the conservation plan or agreement; 
and
    (iii) Whether the conservation plan or agreement specifically 
addresses the habitat of the species for which critical habitat is 
being designated and meets the conservation needs of the species in the 
planning area.
    We are not excluding any areas under private or other non-Federal 
conservation plans related to permits under section 10 of the Act.

Tribal Lands

    Several Executive Orders, Secretarial Orders, and policies concern 
working with Tribes. These guidance documents generally confirm our 
trust responsibilities to Tribes, recognize that Tribes have sovereign 
authority to control Tribal lands, emphasize the importance of 
developing partnerships with Tribal governments, and direct the Service 
to consult with Tribes on a government-to-government basis. When we 
undertake a discretionary 4(b)(2) exclusion analysis, we will always 
consider exclusion of Tribal lands, and give great weight to Tribal 
concerns in analyzing the benefits of exclusion. However, Tribal 
concerns are not a factor in determining what areas, in the first 
instance, meet the definition of ``critical habitat.''
    A joint Secretarial Order that applies to both the Service and the 
National Marine Fisheries Service (NMFS)--Secretarial Order 3206, 
American Indian Tribal Rights, Federal-Tribal Trust Responsibilities, 
and the Endangered Species Act (June 5, 1997) (S.O. 3206)--is the most 
comprehensive of the various guidance documents related to Tribal 
relationships and Act implementation, and it provides the most detail 
directly relevant to the designation of critical habitat. In addition 
to the general direction discussed above, the Appendix to S.O. 3206 
explicitly recognizes the right of Tribes to participate fully in any 
listing process, including designation of critical habitat. S.O. 3206 
also states that critical habitat shall not be designated on Indian 
lands unless such areas are determined essential to conserve a listed 
species. In designating critical habitat, the Service and NMFS shall 
evaluate and document the extent to which the conservation needs of the 
listed species can be achieved by limiting the designation to other 
lands. In light of this instruction, when we undertake a discretionary 
section 4(b)(2) exclusion analysis, we will always consider exclusions 
of Tribal lands under section 4(b)(2) of the Act prior to finalizing a 
designation of critical habitat, and will give great weight to Tribal 
concerns in analyzing the benefits of exclusion (see Policy Regarding 
Implementation of Section 4(b)(2) of the Endangered Species Act (81 FR 
7226; February 11, 2016)).
    However, S.O. 3206 does not preclude us from designating Tribal 
lands or waters as critical habitat, nor does it state that Tribal 
lands or waters cannot meet the Act's definition of ``critical 
habitat.'' We are directed by the Act to identify areas that meet the 
definition of ``critical habitat'' (i.e., areas occupied at the time of 
listing that contain the essential PBFs that may require special 
management or protection and unoccupied areas that are essential to the 
conservation of a species), without regard to landownership. While S.O. 
3206 provides important direction, it expressly states that it does not 
modify the Secretaries' statutory authority. Our Policy Regarding 
Implementation of Section 4(b)(2) of the Endangered Species Act (81 FR 
7226; February 11, 2016) similarly makes clear that while giving great 
weight to Tribal concerns, such concerns are not a factor in 
determining what areas, in the first instance, meet the definition of 
``critical habitat.''
I. Eagle Creek Unit, Black River Subunit, and Bear Wallow Creek 
Subunit--San Carlos Apache Tribe Fishery Management Plan
    We identified approximately 339 ac (137 ha) of narrow-headed 
gartersnake critical habitat that occurs on San Carlos Apache Tribe 
lands within portions of the Eagle Creek Unit (236 ac (96 ha)), Black 
River Subunit (55 ac (22 ha)), and Bear Wallow Creek Subunit (48 ac (19 
ha)).
    The San Carlos Apache Tribe manages a land area over 1.8 million ac 
(>728,435 ha) in size, ranging in elevation from 2,400 ft (732 m) to 
8,000 ft (2,440 m), in the east-central region of Arizona. In 2005, the 
San Carlos Apache Recreation and Wildlife Department finalized the San 
Carlos Apache Tribe Fishery Management Plan (SCAT FMP; San Carlos 
Apache Tribe 2005, entire), which prescribes fisheries management 
objectives across their reservation. The SCAT FMP addresses both 
management of nonnative sportfish (a source of revenue for the Tribe) 
in reservoirs, stock tanks, and streams, but also contains management 
objectives for native fish. With respect to nonnative sportfish, 
primary management areas include San Carlos Reservoir, Talkalai Lake, 
Seneca Lake, Point of Pines Lake, and Dry Lake (San Carlos Apache Tribe 
2005, p. 4). Stock tanks of larger size are also managed for sportfish. 
Approximately 30 stock tanks on the reservation support recreational 
sport fishing activities. However, erosion and lack of maintenance of 
these tanks have rendered many tanks too shallow to support this use, 
and many tanks have gone dry (San Carlos Apache Tribe 2005, p. 5). 
Approximately 170 miles (273 kilometers) of perennial rivers occur on 
the reservation where sport fishing is managed, including the Black, 
Salt, Gila, San Carlos, and Blue Rivers, as well as Eagle, Willow, Bear 
Wallow, and Bonita Creeks (San Carlos Apache Tribe 2005, pp. 5-6). Of 
these streams on the reservation, narrow-headed gartersnakes are known 
to occur along the Black River, Eagle Creek, and Bear Wallow Creek.
    In general, natural resource management on the San Carlos Apache 
Reservation is guided by a collection of resolutions and management 
plans that cover such topics as wildland fire, forest, and range, 
including specific management plans for southwestern willow flycatchers 
and Mexican spotted owls (Strix occidentalis lucida) (San Carlos Apache 
Tribe 2005, p. 50). The

[[Page 58505]]

SCAT FMP is tiered off the Tribe's integrated resource management plan, 
which is further tiered to their strategic plan (San Carlos Apache 
Tribe 2005, p. 50).
    The SCAT FMP ``sets the framework to conserve, enhance, and restore 
nongame, threatened and endangered native fish and their habitats as 
part of the overall natural diversity found on the Reservation for the 
enjoyment by present and future generations'' (San Carlos Apache Tribe 
2005, p. 63). The SCAT FMP has six goals relevant to native fish 
management, each of which has identified objectives, actions, and 
evaluations (San Carlos Apache Tribe 2005, pp. 63-71).
    The first goal is to develop and implement integrated, watershed-
based approaches to fishery resource management. The primary objective 
of this goal is to identify native fish management units within each of 
the six subbasins on the Reservation and develop initial management 
recommendations for each management unit (San Carlos Apache Tribe 2005, 
p. 64). Implementing this objective requires the identification of 
needs for native fish within each management unit. Evaluation for 
meeting this objective includes considering which native fish occur and 
where, developing decision-based criteria, comparing the value of 
native fish to that of its relative sport fish value, and determining 
future management recommendations for the best overall use of each 
management unit (San Carlos Apache Tribe 2005, p. 64).
    The second goal under the SCAT FMP is to ``conserve, enhance, and 
maintain existing native fish populations and their habitats as part of 
the natural diversity of the Reservation as a home and abiding place 
for Tribal members'' (San Carlos Apache Tribe 2005, p. 65). Five 
objectives are identified to implement this goal: Developing a survey 
program, determining the status of natives fishes within streams on the 
Reservation and possible corrective actions to improve their status 
where necessary, prioritizing research needs, developing an ``Adopt a 
Stream'' program to facilitate monitoring and protection of aquatic and 
riparian resources, and developing a contingency plan to address 
catastrophic drought and wildfire events (San Carlos Apache Tribe 2005, 
p. 67).
    The third goal of the SCAT FMP is to restore extirpated fishes and 
degraded natural habitats when appropriate and economically feasible. 
To accomplish this goal, the Tribe develops and implements guidelines 
for reintroduction, translocation, and reestablishment of native fishes 
and their habitats by completing a needs assessment for native fishes 
on the Reservation (San Carlos Apache Tribe 2005, pp. 67-68).
    The fourth goal of the SCAT FMP is to prevent, minimize, or 
mitigate adverse impacts to all native fishes, particularly threatened 
or endangered species, and their habitats when consistent with the 
Reservations values as a home and abiding place for Tribal members. 
Five actions are listed to achieve this goal: Participation in section 
7 consultations; participation in the Tribal integrated resource 
management planning process; literature reviews pertaining to best 
practices and alternative uses; education and demonstrations to benefit 
Tribal Cattle Association members; and the review and recommendation of 
land use practices, policies, and plans to minimize adverse impacts to 
native fish and their habitats (San Carlos Apache Tribe 2005, pp. 68-
69).
    The fifth goal of the SCAT FMP includes education to increase 
Tribal awareness of native fish conservation and values through 
identification of Tribal perceptions and attitudes regarding native 
fish. A minimum of once per year, the Tribe plans and participates in 
public workshops that discuss native fish biology, conservation, and 
management. In addition to these topics, at these workshops the Tribe 
discusses how to reduce impacts and improve status of native fishes 
(San Carlos Apache Tribe 2005, pp. 69-70).
    The final goal of the SCAT FMP requires the Tribe to pursue funding 
to support all previously stated goals and objectives outlined in the 
SCAT FMP (San Carlos Apache Tribe 2005, p. 70).

Benefits of Inclusion--San Carlos Apache Tribe Fishery Management Plan

    As discussed above under Effects of Critical Habitat Designation, 
Section 7 Consultation, Federal agencies, in consultation with the 
Service, must ensure that their actions are not likely to jeopardize 
the continued existence of any listed species or result in the 
destruction or adverse modification of any designated critical habitat 
of such species. The difference in the costs or outcomes of the 
jeopardy analysis and the adverse modification analysis represents the 
regulatory benefit of critical habitat. A critical habitat designation 
requires Federal agencies to consult on whether their activity would 
destroy or adversely modify critical habitat to the point where 
recovery could not be achieved.
    Because the species occurs in Eagle Creek, Black River, and Bear 
Wallow Creek, the benefits of a critical habitat designation are 
reduced to the possible incremental benefit of critical habitat because 
the designation would not be the sole catalyst for initiating section 7 
consultation. However, should a catastrophic event such as disease, 
drought, wildfire, chemical spill, etc., result in potential or 
statistically-proven, actual extirpation of the gartersnake population 
in this area, designation of critical habitat would ensure future 
Federal actions do not result in adverse modification of critical 
habitat, allowing for future recovery actions to occur.
    Were we to designate critical habitat on these Tribal lands, our 
section 7 consultation history indicates that there may be some, but 
few, regulatory benefits to the narrow-headed gartersnake. As described 
above, even with narrow-headed gartersnakes occurring on these Tribal 
lands, no formal section 7 consultations have yet to occur. When we 
review future projects addressing the narrow-headed gartersnake 
pursuant to section 7 of the Act in Arizona, we will examine 
conservation measures associated with the project for their value in 
the conservation of narrow-headed gartersnakes or their habitat. Where 
there is consistency with managing habitat and implementing suitable 
conservation measures, it would be unlikely that a consultation would 
result in a determination of adverse modification of critical habitat. 
Therefore, when the threshold for adverse modification is not reached, 
only additional conservation recommendations could result from a 
section 7 consultation, but such measures would be discretionary on the 
part of the Federal agency.
    Another important benefit of including lands in a critical habitat 
designation is that the designation can serve to inform and educate 
landowners and the public regarding the potential conservation value of 
an area, and may help focus management efforts on areas of high value 
for certain species. The Tribe, through their Recreation and Wildlife 
Department, surveys all proposed home and construction projects, and 
provides information from the SCAT FMP for use in negotiating water 
exchanges and in determining mitigation measures for projects that may 
impact listed species or their habitat. Therefore, the Recreation and 
Wildlife Department has an opportunity to provide information regarding 
the species and its habitat across the Reservation. In addition, the 
Tribe has

[[Page 58506]]

adopted an interdisciplinary team approach to all natural resources 
matters. The team works together to provide an ecosystem management 
approach in developing strategic plans and management plans. Through 
this team, Tribal members can be informed of steps necessary to 
conserve native fish and their habitat as the prey base for narrow-
headed gartersnakes.
    Another possible benefit of the designation of critical habitat is 
that it may also affect the implementation of Federal laws, such as 
NEPA or the Clean Water Act. These laws require analysis of the 
potential for proposed projects to significantly affect the 
environment. Critical habitat may signal the presence of sensitive 
habitat that could otherwise be missed in the review process for these 
other environmental laws.
    Therefore, because of the development and implementation of a 
management plan, ongoing habitat conservation, the rare initiation of 
formal section 7 consultations, the occurrence of narrow-headed 
gartersnakes on Tribal lands, and the Service's coordination with 
Tribes on gartersnake-related issues, it is expected that there may be 
some, but limited, benefits from including these Tribal lands in a 
narrow-headed gartersnake critical habitat designation. The principal 
benefit of any designated critical habitat is that activities in and 
affecting such habitat require consultation under section 7 of the Act. 
Such consultation would ensure that adequate protection is provided to 
avoid destruction or adverse modification of critical habitat.

Benefits of Exclusion--San Carlos Apache Tribe Fishery Management Plan

    The benefits of excluding San Carlos Apache Tribe lands from 
designated critical habitat in portions of Eagle Creek, Black River, 
and Bear Wallow Creek include: (1) Demonstrating our commitment to 
defer to the Tribe to develop and implement conservation and natural 
resource management plans for their lands and resources, which includes 
benefits to the narrow-headed gartersnake and its habitat that might 
not otherwise occur; (2) the continuance and strengthening of our 
effective working relationships with the Tribe to promote conservation 
of narrow-headed gartersnakes through that of native fish and their 
habitat, as well as other federally listed species; and (3) promoting 
continued meaningful collaboration and cooperation in working toward 
recovering native aquatic communities, including narrow-headed 
gartersnake habitat.
    Because the Tribe is the entity that enforces protective 
regulations on Tribal trust reservation land, and because we have a 
working relationship with them, we believe exclusion of these lands 
will yield a significant partnership benefit. The Tribe is coordinating 
with the AGFD and the Service on surveys and captive propagation plans 
for native fish, which furthers conservation of narrow-headed 
gartersnakes. We continue to work cooperatively with the Tribe on 
efforts to conserve spikedace and loach minnow on the Reservation, 
which benefits other native fish as the primary prey base for narrow-
headed gartersnakes.
    During this rulemaking process, we have communicated with the San 
Carlos Apache Tribe to discuss how they might be affected by the 
regulations associated with listing and designating critical habitat 
for the narrow-headed gartersnake. We have determined that the San 
Carlos Apache Nation should be the governmental entity to manage and 
promote narrow-headed gartersnake conservation on their lands. During 
our coordination efforts with the San Carlos Apache Tribe, we 
recognized and endorsed their fundamental right to provide for Tribal 
resource management activities, including those relating to aquatic 
habitat that supports narrow-headed gartersnakes. As outlined above, 
the San Carlos Apache Tribe has developed and implemented a fisheries 
management plan specific to needs of prey and habitat for narrow-headed 
gartersnakes. Overall, the commitments toward management of narrow-
headed gartersnake habitat by the San Carlos Apache Tribe will likely 
accomplish greater conservation than would be available through a 
designation of critical habitat.
    The designation of critical habitat would be viewed as an intrusion 
and impact the Tribe's sovereign ability to manage natural resources in 
accordance with their own policies, customs, and laws. These impacts 
include, but are not limited to: (1) Limiting the San Carlos Apache 
Tribe's ability to protect and control its own resources on its lands; 
(2) undermining the positive and effective government-to-government 
relationship between the Tribe and the Service--a relationship that 
serves to protect federally listed species and their habitat; and (3) 
hampering or confusing the Tribe's own long-standing protections for 
the Eagle Creek, Black River, and Bear Wallow Creek. The perceived 
restrictions of a critical habitat designation could have a damaging 
effect on coordination efforts, possibly preventing actions that might 
maintain, improve, or restore habitat for the narrow-headed gartersnake 
and other species. We view this as a substantial benefit since we have 
developed a cooperative working relationship with the Tribe for the 
mutual benefit of the gartersnake and other endangered and threatened 
species.
    In addition, we anticipate that future management plans, including 
additional conservation efforts for other listed species and their 
habitats, may be hampered if critical habitat is designated on Tribal 
lands already being managed for sensitive species conservation. We have 
determined that many Tribes are willing to work cooperatively with us 
and others to benefit other listed and sensitive species, but only if 
they view the relationship as mutually beneficial. Consequently, the 
development of future voluntary management actions for other listed 
species may be compromised if these Tribal lands are designated as 
critical habitat for the narrow-headed gartersnake. Thus, a benefit of 
excluding these lands would be future conservation efforts that would 
benefit other listed or sensitive species.

Benefits of Exclusion Outweigh the Benefits of Inclusion--San Carlos 
Apache Tribe Fishery Management Plan

    The benefits of including San Carlos Apache Tribal lands in the 
critical habitat designation are limited to the incremental benefits 
gained through the regulatory requirement to consult under section 7, 
the consideration of the need to avoid adverse modification of critical 
habitat, and interagency and educational awareness. However, due to the 
rarity of Federal actions resulting in formal section 7 consultations, 
the benefits of a critical habitat designation are minimized. In 
addition, the benefits of consultation are further minimized because 
any conservation measures that may have resulted from consultation are 
already provided through the conservation benefits to the narrow-headed 
gartersnake and its habitat from implementation of the SCAT FMP.
    The Tribe has indicated a commitment to traditional ecological 
knowledge (TEK), which uses an ecosystem-based approach to land and 
species management and preservation. In addition, they have developed 
the Fisheries Management Plan, which benefits spikedace and loach 
minnow specifically and, by extension, all native fish, by 
discontinuing nonnative fish stocking in areas important for their 
conservation. Further, the Tribe is working with both the Service and 
the AGFD to these ends.

[[Page 58507]]

    The Tribe has focused on known areas of concern for the species' 
management and has discontinued stocking of nonnative fishes in some 
areas, including the Eagle Creek watershed. The Fisheries Management 
Plan contains goals of conserving and enhancing native fishes on the 
Reservation; restoring native fishes and their habitats; and 
preventing, minimizing, or mitigating impacts to native fishes, among 
others. In addition, the Tribe has indicated that, through TEK, they 
practice an ecosystem-based approach to land- and species-based 
management and preservation. We conclude that the benefits to be gained 
through the Fisheries Management Plan, coordination with the Service 
and AGFD, discontinuance of sportfish stocking, and proactive measures 
for native fish all indicate that the Tribe has committed to 
conservation measures that exceed benefits to be gained through a 
critical habitat designation. Collectively, these measures help secure 
native fish communities on the Reservation, which are critical to the 
continued survival of the narrow-headed gartersnake. As a result, we 
have determined that the benefits of excluding these Tribal lands from 
critical habitat designation outweigh the benefits of including these 
areas.

Exclusion Will Not Result in Extinction of the Species--San Carlos 
Apache Tribe Fisheries Management Plan

    We have determined that exclusion of San Carlos Apache Tribe lands 
from the critical habitat designation will not result in the extinction 
of the narrow-headed gartersnake. We base this determination on several 
points. First, as discussed above under Effects of Critical Habitat 
Designation, Section 7 Consultation, if a Federal action or permitting 
occurs, the known presence of narrow-headed gartersnakes would require 
evaluation under the jeopardy standard of section 7 of the Act, even 
absent the designation of critical habitat, and thus will protect the 
species against extinction. Second, the San Carlos Apache Tribe has a 
long-term record of conserving species and habitat and is committed to 
protecting and managing narrow-headed gartersnake habitat according to 
their cultural history, management plans, and natural resource 
management objectives. We have determined that this commitment 
accomplishes greater conservation than would be available through a 
designation of critical habitat. For these reasons, we have determined 
that our working relationships with the Tribe would be better 
maintained if we excluded their lands from the designation of narrow-
headed gartersnake critical habitat. With the implementation of these 
conservation measures, based upon strategies developed in the SCAT FMP, 
we have concluded that the benefits of excluding the San Carlos Apache 
Tribe lands outweigh the benefits of their inclusion, and the exclusion 
of these lands from the designation will not result in the extinction 
of the species. As a result, we are excluding San Carlos Apache Tribe 
lands within the Eagle Creek Unit (236 ac (96 ha)), Black River Subunit 
(55 ac (22 ha)), and Bear Wallow Creek Subunit (48 ac (19 ha)).
II. Canyon Creek Unit, and Black River, Bear Wallow Creek, and 
Reservation Creek Subunits--White Mountain Apache Tribe Native Fishes 
Management Plan
    We identified approximately 169 ac (68 ha) of narrow-headed 
gartersnake critical habitat that occurs on White Mountain Apache Tribe 
lands within portions of the Black River Subunit (56 ac (23 ha)), Bear 
Wallow Creek Subunit (<0.01 ac (<0.01 ha)), Reservation Creek Subunit 
(36 ac (15 ha)), and Canyon Creek Unit (77 ac (31 ha)).
    The White Mountain Apache Tribe's Fort Apache Indian Reservation 
encompasses approximately 1,680,000 acres in east-central Arizona, 
ranging in elevation from 11,590 to 2,640 ft (White Mountain Apache 
Tribe 2014, p. 1). A total of 23 artificial reservoirs were created on 
the Reservation to provide recreational opportunities such as fishing, 
boating, and camping permits (White Mountain Apache Tribe 2014, p. 1). 
The White Mountain Apache Tribe Native Fishes Management Plan (WMAT 
NFMP) identified native fish species that are historically known from 
the Reservation and provides available information on their current 
status and distribution. The WMAT NFMP also identified significant 
stressors to native fish, which include dewatering, sedimentation, 
mechanical stream channel alteration, and interactions with nonnative 
aquatic species. The WMAT NFMP lists guidance- and direction-related 
documents, management plans, ordinances and codes, and Tribal 
resolutions that help address these issues and many others which could 
affect natural resources on the Reservation and are currently in effect 
(White Mountain Apache Tribe 2014, pp. 11-15). These guidance documents 
include the Tribe's 2000 Loach Minnow Management Plan and Resolution 
#89-149, which designates streams and riparian zones as Sensitive Fish 
and Wildlife areas, requiring that authorized programs ensure these 
zones remain productive for fish and wildlife.
    The primary purpose of the WMAT NFMP is to ``promote the practical 
and effective long-term conservation of all native fish populations and 
their habitats found on the Reservation'' (White Mountain Apache Tribe 
2014, p. 19). The WMAT NFMP ``sets the framework to conserve, enhance, 
and if possible, restore non-game, threatened and endangered native 
fish and their habitats as part of the overall natural diversity found 
on the Reservation for the enjoyment of present and future generations 
of Apache people'' (White Mountain Apache Tribe 2014, p. 19). To 
accomplish this, four primary goals are set forth in the WMAT NFMP.
    The first goal of the WMAT NFMP is to conserve and maintain 
existing native fish populations and their habitats as part of the 
natural diversity of the Reservation when consistent with the 
Reservation as a homeland for White Mountain Apache Tribal members 
(White Mountain Apache Tribe 2014, p. 20). To accomplish this, via 
literature review and expert consultation, the Tribe developed a 
protocol for standardized sampling and data analysis specific to the 
inventory, survey, population modeling, monitoring, and other 
management techniques for all native fishes and their habitats. This 
protocol will be used to determine the current distribution and 
relative abundance of all native fishes and their habitats, with an 
emphasis on rare or sensitive species in order to identify native fish 
management units within each of the watersheds on the Reservation to 
develop initial management recommendations for each (White Mountain 
Apache Tribe 2014, p. 20). The Tribe has also committed to updating the 
Loach Minnow Management Plan as well as follow the management 
strategies in the Apache Trout Recovery Plan. These actions will help 
develop research needs and implement research in the field. Under this 
first goal, the Tribe also intends to develop an ``Adopt-a-Lake/
Stream'' program, where Tribal members volunteer to help monitor and 
protect aquatic riparian resources (White Mountain Apache Tribe 2014, 
p. 23).
    The second goal of the WMAT NFMP is to enhance native fish 
populations and degraded natural habitats when appropriate and 
economically feasible by: (1) Developing guidelines for enhancing 
native fish populations and their habitats; (2) investigating available 
funding opportunities and requirements to support all Tribal 
conservation and management activities for all native fishes, their 
habitats, and other listed

[[Page 58508]]

aquatic and riparian obligate species and their habitats; (3) 
developing proposals to secure funding necessary to continue 
conservation and management activities that will benefit all existing 
native fishes, their habitats, and other listed aquatic and riparian 
obligate species and their habitats; and (4) restoring and enhancing 
native fish habitats and populations according to guidance developed 
(White Mountain Apache Tribe 2014, pp. 24-25).
    The third goal of the WMAT NFMP is to prevent, minimize, or 
mitigate adverse impacts to all native fishes, especially threatened or 
endangered, and their habitats when consistent with the purpose of the 
Reservation as a permanent homeland for White Mountain Apache Tribal 
members by: (1) Identifying species and habitat types that are 
declining or imperiled, or likely to become imperiled, in the 
foreseeable future and the threats causing decline; (2) identifying 
possible corrective actions needed to limit or mitigate adverse impacts 
to native fish and their habitats where appropriate and economically 
feasible, including consideration of threats and mitigation measures to 
multiple listed candidate or proposed aquatic or riparian obligate 
species; and (3) collaborating with others to maintain or enhance 
native fish populations and their habitats or prevent avoidable and 
mitigate unavoidable losses (White Mountain Apache Tribe 2014, pp. 25-
27).
    The fourth and final goal of the WMAT NFMP focuses on increasing 
Tribal awareness of native fish conservation and values. The WMAT NFMP 
proposes to accomplish this by: (1) Identifying Tribal perceptions and 
attitudes regarding nongame, threatened, and endangered native fishes; 
(2) annually developing, sponsoring, and participating in educational 
workshops and presentations pertaining to the biology, conservation, 
and management of nongame, threatened, or endangered native fishes and 
their habitats; and (3) informing the Tribe of the status of nongame, 
threatened, and endangered native fishes and threats to their 
protection and maintenance, and Tribal actions to reduce or eliminate 
such adverse impacts (White Mountain Apache Tribe 2014, pp. 28-29).
    The White Mountain Apache Tribe has a process to review and approve 
all development activities on the Reservation. The Tribal Plan and 
Project Review Panel, among other things, investigates impacts to 
sensitive habitats and species, and provides for the implementation of 
mitigation measures to avoid adverse impacts to those resources. To 
assist, the White Mountain Apache Tribe has a full-time Sensitive 
Species Coordinator and Technician who coordinates and participates in 
protection, research, management, and administrative activities 
involving Federally listed sensitive species on the Reservation.
    The White Mountain Apache Tribe's Loach Minnow Management Plan also 
provides transitory benefits to narrow-headed gartersnake conservation. 
The goals of the Loach Minnow Management Plan are to determine and 
quantify the full extent of loach minnow distribution on the 
Reservation; continue to develop and strengthen management actions that 
effectively address species threats and that provide adequate 
protection for, and sustainability of, existing Reservation loach 
minnow populations and habitats; complete the development and ongoing 
maintenance of Tribal data, information, and mapping for this and other 
native fish species; and evaluate and refine the application of Plan 
management practices, over time, in a manner that promotes the 
practical and effective long-term conservation of all Reservation 
native fish populations and assemblages, including those of loach 
minnow (White Mountain Apache Tribe 2000).
    The Loach Minnow Management Plan provides an action and strategy 
outline with eight steps that provide additional detail on how they 
will be carried out. The eight steps of the management plan that may 
affect PBFs of the narrow-headed gartersnake include:
     Determining the distribution of loach minnow within 
Reservation boundaries;
     Continuing routine surveys and expanding efforts to 
include habitat assessment;
     Continuing to monitor and refine existing management 
treatments involving irrigation uses and activities to develop adequate 
mitigation against related threats;
     Continuing to apply and refine existing monitoring and 
mitigation protocols involving low water and/or drought conditions to 
provide sustainable protection of loach minnow populations;
     Developing contingency plans with responses to potential 
catastrophic events;
     Evaluating and refining existing nonnative fish management 
and mitigation practices to provide sustainable protection of loach 
minnow populations and habitat;
     Organizing data collection, handling, storage, and 
maintenance among partners; and
     Continuing to monitor and refine existing Tribal Plan and 
Project Review Process, management plans, and practices to meet loach 
minnow and native fish management goals.

Benefits of Inclusion--White Mountain Apache Tribe Native Fishes 
Management Plan

    As discussed above under Effects of Critical Habitat Designation, 
Section 7 Consultation, Federal agencies, in consultation with the 
Service, must ensure that their actions are not likely to jeopardize 
the continued existence of any listed species or result in the 
destruction or adverse modification of any designated critical habitat 
of such species. The difference in the costs or outcomes of the 
jeopardy analysis and the adverse modification analysis represents the 
regulatory benefit of critical habitat. A critical habitat designation 
requires Federal agencies to consult on whether their activity would 
destroy or adversely modify critical habitat to the point where 
recovery could not be achieved.
    Because the species occurs in the area, the benefits of a critical 
habitat designation are reduced to the possible incremental benefit of 
critical habitat because the designation would not be the sole catalyst 
for initiating section 7 consultation. However, should a catastrophic 
event such as disease, drought, wildfire, chemical spill, etc., result 
in potential or statistically-proven, actual extirpation of the 
gartersnake population in this area, designation of critical habitat 
would ensure future Federal actions do not result in adverse 
modification of critical habitat, allowing for future recovery actions 
to occur.
    Were we to designate critical habitat on these Tribal lands, our 
section 7 consultation history indicates that there may be some, but 
few, regulatory benefits to the narrow-headed gartersnake. As described 
above, even with narrow-headed gartersnakes occurring on these Tribal 
lands, formal section 7 consultations have yet to occur. When we review 
future projects addressing the narrow-headed gartersnake pursuant to 
section 7 of the Act in Arizona, we examine conservation measures 
associated with the project for their value in the conservation of 
narrow-headed gartersnakes or their habitat. Where there is consistency 
with managing habitat and implementing suitable conservation measures, 
it would be unlikely that a consultation would result in a 
determination of adverse modification of critical habitat. Therefore, 
when the threshold for

[[Page 58509]]

adverse modification is not reached, only additional conservation 
recommendations could result from a section 7 consultation, but such 
measures would be discretionary on the part of the Federal agency.
    Another important benefit of including lands in a critical habitat 
designation is that the designation can serve to inform and educate 
landowners and the public regarding the potential conservation value of 
an area, and may help focus management efforts on areas of high value 
for certain species. The White Mountain Apache Tribe has developed 
management plans for the loach minnow and native fish in general, and 
currently employs a Sensitive Species Coordinator through which 
education of Tribal members can occur without critical habitat 
designation. In addition, Tribal fisheries biologists participate in 
review of development projects and timber sales and can work to educate 
project proponents of the species' needs.
    Another possible benefit of the designation of critical habitat is 
that it may also affect the implementation of Federal laws, such as 
NEPA or the Clean Water Act. These laws require analysis of the 
potential for proposed projects to significantly affect the 
environment. Critical habitat may signal the presence of sensitive 
habitat that could otherwise be missed in the review process for these 
other environmental laws.
    Therefore, because of the development and implementation of a 
native fish management plan, ongoing habitat conservation, the rare 
initiation of formal section 7 consultations, the occurrence of narrow-
headed gartersnakes on Tribal lands, and the Service's coordination 
with Tribes on gartersnake-related issues, it is expected that there 
may be some, but limited, benefits from including these Tribal lands in 
a narrow-headed gartersnake critical habitat designation. The principal 
benefit of any designated critical habitat is that activities in and 
affecting such habitat require consultation under section 7 of the Act. 
Such consultation would ensure that adequate protection is provided to 
avoid destruction or adverse modification of critical habitat.

Benefits of Exclusion--White Mountain Apache Tribe Native Fishes 
Management Plan

    The benefits of excluding White Mountain Apache Tribe lands from 
designated critical habitat in portions of Black River, Bear Wallow 
Creek, and Reservation Creek subunits, and in Canyon Creek Unit 
include: (1) Our deference to the Tribe to develop and implement 
conservation and natural resource management plans for their lands and 
resources, which includes benefits to the narrow-headed gartersnake and 
its habitat that might not otherwise occur; (2) the continuance and 
strengthening of our effective working relationships with the Tribe to 
promote conservation of narrow-headed gartersnakes through that of 
native fish and their habitat, as well as other federally listed 
species; and (3) promoting continued meaningful collaboration and 
cooperation in working toward recovering native aquatic communities, 
including narrow-headed gartersnake habitat.
    Taken individually or collectively, the White Mountain Apache 
Tribe's commitments to the conservation of riparian and aquatic 
habitats and the native fishes that depend on them offers a strong 
foundation for future conservation of the narrow-headed gartersnake. As 
we have carefully detailed in this and previous rulemakings pertaining 
to the narrow-headed gartersnake, the protection, conservation, and 
recovery of native fish communities is of utmost importance to the 
continued existence of the narrow-headed gartersnake because this 
species is a predatory specialist which preys only on fish. Therefore, 
the conservation of native fish communities will provide the suite of 
protections required to sustain its prey base and maintain gartersnake 
populations on the Reservation and elsewhere such protections are 
afforded.
    During this rulemaking process, we have communicated with the White 
Mountain Apache Tribe to discuss how they might be affected by the 
regulations associated with listing and designating critical habitat 
for the narrow-headed gartersnake. We have determined that the White 
Mountain Apache Tribe should be the governmental entity to manage and 
promote narrow-headed gartersnake conservation on their lands. During 
our coordination efforts with the White Mountain Apache Tribe, we 
recognized and endorsed their fundamental right to provide for Tribal 
resource management activities, including those relating to aquatic 
habitat that supports narrow-headed gartersnakes. As outlined above, 
the White Mountain Apache Tribe has developed and implemented a native 
fishes management plan specific to needs of prey and habitat for 
narrow-headed gartersnakes. Overall, the commitments toward management 
of narrow-headed gartersnake habitat by the White Mountain Apache Tribe 
will likely accomplish greater conservation than would be available 
through a designation of critical habitat.
    The designation of critical habitat would be viewed as an intrusion 
and impact their sovereign abilities to manage natural resources in 
accordance with the Tribe's own policies, customs, and laws. These 
impacts include, but are not limited to: (1) Limiting the White 
Mountain Apache Tribe's ability to protect and control its own 
resources on its lands; (2) undermining the positive and effective 
government-to-government relationship between the Tribe and the 
Service--a relationship that serves to protect federally listed species 
and their habitat; and (3) hampering or confusing the Tribe's own long-
standing protections for the Black River, Reservation Creek, Bear 
Wallow Creek, and Canyon Creek. The perceived restrictions of a 
critical habitat designation could have a damaging effect on 
coordination efforts, possibly preventing actions that might maintain, 
improve, or restore habitat for the narrow-headed gartersnake and other 
species. Our working relationships with the Tribe would be better 
maintained if we excluded their lands from the designation of narrow-
headed gartersnake critical habitat. We view this as a substantial 
benefit since we have developed a cooperative working relationship with 
the White Mountain Apache Tribe for the mutual benefit of the narrow-
headed gartersnake and other endangered and threatened species.

Benefits of Exclusion Outweigh the Benefits of Inclusion--White 
Mountain Apache Tribe Native Fishes Management Plan

    The benefits of including White Mountain Apache Tribal lands in the 
critical habitat designation are limited to the incremental benefits 
gained through the regulatory requirement to consult under section 7, 
the consideration of the need to avoid adverse modification of critical 
habitat, and interagency and educational awareness. However, due to the 
rarity of Federal actions resulting in formal section 7 consultations, 
the benefits of a critical habitat designation are minimized. In 
addition, the benefits of consultation are further minimized because 
any conservation measures that may have resulted from consultation are 
already provided through the conservation benefits to the narrow-headed 
gartersnake and its habitat from implementation of the White Mountain 
Apache Tribe Native Fishes Management Plan.
    The White Mountain Apache Tribe clearly explained their sovereign

[[Page 58510]]

authority to promulgate regulations and management plans to protect and 
manage Tribal trust lands, wildlife, forests, and other natural 
resources, and cited numerous authorities that confirm their authority 
over wildlife and other natural resources existing within their 
ancestral lands. In addition, they have shown a commitment to other 
federally listed species, such as the loach minnow and Mexican spotted 
owl.
    Based on our working relationship with the White Mountain Apache 
Tribe, their demonstration of conservation through past efforts, and 
the protective provisions of the WMAT NFMP and Loach Minnow Management 
Plan, we have determined that the benefits of excluding these Tribal 
lands from critical habitat designation outweigh the benefits of 
including these areas.

Exclusion Will Not Result in Extinction of the Species--White Mountain 
Apache Tribe Native Fishes Management Plan

    We have determined that exclusion of White Mountain Apache Tribe 
lands from the critical habitat designation will not result in the 
extinction of the narrow-headed gartersnake. We base this determination 
on several points. First, as discussed above under Effects of Critical 
Habitat Designation, Section 7 Consultation, if a Federal action or 
permitting occurs, the known presence of narrow-headed gartersnakes 
would require evaluation under the jeopardy standard of section 7 of 
the Act, even absent the designation of critical habitat, and thus will 
protect the species against extinction. Second, the White Mountain 
Apache Tribe has a long-term record of conserving species and habitat 
and is committed to protecting and managing narrow-headed gartersnake 
habitat according to their cultural history, management plans, and 
natural resource management objectives. We have determined that this 
commitment accomplishes greater conservation than would be available 
through a designation of critical habitat. With the implementation of 
these conservation measures, based upon strategies developed in the 
WMAT NFMP and Loach Minnow Management Plan, we have determined that the 
benefits of excluding the White Mountain Apache Tribe lands outweigh 
the benefits of their inclusion, and the exclusion of these lands from 
the designation will not result in the extinction of the species. As a 
result, we are excluding White Mountain Apache Tribe lands within the 
Black River Subunit (56 ac (23 ha)), Bear Wallow Creek Subunit (<0.01 
ac (<0.01 ha)), Reservation Creek Subunit (36 ac (15 ha)), and Canyon 
Creek Unit (77 ac (31 ha)).

Summary of Exclusions Under 4(b)(2) of the Act

    Table 2 below presents areas of lands that meet the definition of 
critical habitat but for which we are excluding from this final 
critical habitat designation for the narrow-headed gartersnake.

    Table 2--Areas Excluded From Critical Habitat Designation by Critical Habitat Unit for the Narrow-Headed
                                                   Gartersnake
----------------------------------------------------------------------------------------------------------------
                                      Landowner,       Proposed critical   Area excluded (ac    Final critical
          Unit subunit               property name     habitat (ac (ha))         (ha))         habitat (ac (ha))
----------------------------------------------------------------------------------------------------------------
                                                Eagle Creek Unit
----------------------------------------------------------------------------------------------------------------
Eagle Creek.....................  San Carlos Apache   336 (136).........  236 (96)..........  100 (41)
                                   Tribe.
Unit total being excluded.......  ..................  ..................  236 (96)..........  ..................
----------------------------------------------------------------------------------------------------------------
                                            Black River Subbasin Unit
----------------------------------------------------------------------------------------------------------------
Black River.....................  San Carlos Apache   763 (309).........  55 (22)...........  652 (264)
                                   Tribe.
                                  White Mountain      ..................  56 (23)...........
                                   Apache Tribe.
Bear Wallow Creek...............  San Carlos Apache   174 (71)..........  48 (19)...........  126 (51)
                                   Tribe.
                                  White Mountain      ..................  <.01 (<.01).......  ..................
                                   Apache Tribe.
Reservation Creek...............  White Mountain      132 (54)..........  36 (15)...........  96 (39)
                                   Apache Tribe.
Unit total being excluded.......  ..................  ..................  195 (79)..........  ..................
----------------------------------------------------------------------------------------------------------------
                                                Canyon Creek Unit
----------------------------------------------------------------------------------------------------------------
Canyon Creek....................  White Mountain      232 (94)..........  77 (31)...........  155 (63)
                                   Apache Tribe.
Unit total being excluded.......  ..................  ..................  77 (31)...........  ..................
                                                     -----------------------------------------------------------
    Grand Total.................  ..................  ..................  508 (206).........
----------------------------------------------------------------------------------------------------------------

Required Determinations

Regulatory Planning and Review (Executive Orders 12866 and 13563)

    Executive Order 12866 provides that the Office of Information and 
Regulatory Affairs (OIRA) in the Office of Management and Budget will 
review all significant rules. OIRA has determined that this rule is not 
significant.
    Executive Order 13563 reaffirms the principles of E.O. 12866 while 
calling for improvements in the nation's regulatory system to promote 
predictability, to reduce uncertainty, and to use the best, most 
innovative, and least burdensome tools for achieving regulatory ends. 
The executive order directs agencies to consider regulatory approaches 
that reduce burdens and maintain flexibility and freedom of choice for 
the public where these approaches are relevant, feasible, and 
consistent with regulatory objectives. E.O. 13563 emphasizes further 
that regulations must be based on the best available science and that 
the rulemaking process must allow for public participation and an open 
exchange of ideas. We have developed this rule in a manner consistent 
with these requirements.

Regulatory Flexibility Act (5 U.S.C. 601 et seq.)

    Under the Regulatory Flexibility Act (RFA; 5 U.S.C. 601 et seq.), 
as amended by the Small Business Regulatory Enforcement Fairness Act of 
1996 (SBREFA; 5 U.S.C. 801 et seq.), whenever an agency is required to 
publish a notice of rulemaking for any proposed or final rule, it must 
prepare and make available for public comment a regulatory flexibility 
analysis that

[[Page 58511]]

describes the effects of the rule on small entities (i.e., small 
businesses, small organizations, and small government jurisdictions). 
However, no regulatory flexibility analysis is required if the head of 
the agency certifies the rule will not have a significant economic 
impact on a substantial number of small entities. The SBREFA amended 
the RFA to require Federal agencies to provide a certification 
statement of the factual basis for certifying that the rule will not 
have a significant economic impact on a substantial number of small 
entities.
    According to the Small Business Administration, small entities 
include small organizations such as independent nonprofit 
organizations; small governmental jurisdictions, including school 
boards and city and town governments that serve fewer than 50,000 
residents; and small businesses (13 CFR 121.201). Small businesses 
include manufacturing and mining concerns with fewer than 500 
employees, wholesale trade entities with fewer than 100 employees, 
retail and service businesses with less than $5 million in annual 
sales, general and heavy construction businesses with less than $27.5 
million in annual business, special trade contractors doing less than 
$11.5 million in annual business, and agricultural businesses with 
annual sales less than $750,000. To determine if potential economic 
impacts to these small entities are significant, we considered the 
types of activities that might trigger regulatory impacts under this 
designation as well as types of project modifications that may result. 
In general, the term ``significant economic impact'' is meant to apply 
to a typical small business firm's business operations.
    Under the RFA, as amended, and as understood in light of recent 
court decisions, Federal agencies are required to evaluate only the 
potential incremental impacts of rulemaking on those entities directly 
regulated by the rulemaking itself; in other words, the RFA does not 
require agencies to evaluate the potential impacts to indirectly 
regulated entities. The regulatory mechanism through which critical 
habitat protections are realized is section 7 of the Act, which 
requires Federal agencies, in consultation with the Service, to ensure 
that any action authorized, funded, or carried out by the agency is not 
likely to destroy or adversely modify critical habitat. Therefore, 
under section 7, only Federal action agencies are directly subject to 
the specific regulatory requirement (avoiding destruction and adverse 
modification) imposed by critical habitat designation. Consequently, it 
is our position that only Federal action agencies will be directly 
regulated by this designation. There is no requirement under the RFA to 
evaluate the potential impacts to entities not directly regulated. 
Moreover, Federal agencies are not small entities. Therefore, because 
no small entities will be directly regulated by this rulemaking, the 
Service certifies that this final critical habitat designation will not 
have a significant economic impact on a substantial number of small 
entities.
    During the development of this final rule, we reviewed and 
evaluated all information submitted during the comment period that may 
pertain to our consideration of the probable incremental economic 
impacts of this critical habitat designation. Based on this 
information, we affirm our certification that this final critical 
habitat designation will not have a significant economic impact on a 
substantial number of small entities, and a regulatory flexibility 
analysis is not required.

Energy Supply, Distribution, or Use--Executive Order 13211

    Executive Order 13211 (Actions Concerning Regulations That 
Significantly Affect Energy Supply, Distribution, or Use) requires 
agencies to prepare Statements of Energy Effects when undertaking 
certain actions. In our economic analysis, we did not find that this 
critical habitat designation will significantly affect energy supplies, 
distribution, or use. Therefore, this action is not a significant 
energy action, and no Statement of Energy Effects is required.

Unfunded Mandates Reform Act (2 U.S.C. 1501 et seq.)

    In accordance with the Unfunded Mandates Reform Act (2 U.S.C. 1501 
et seq.), we make the following finding:
    (1) This rule will not produce a Federal mandate. In general, a 
Federal mandate is a provision in legislation, statute, or regulation 
that would impose an enforceable duty upon State, local, or Tribal 
governments, or the private sector, and includes both ``Federal 
intergovernmental mandates'' and ``Federal private sector mandates.'' 
These terms are defined in 2 U.S.C. 658(5)-(7). ``Federal 
intergovernmental mandate'' includes a regulation that ``would impose 
an enforceable duty upon State, local, or Tribal governments'' with two 
exceptions. It excludes ``a condition of Federal assistance.'' It also 
excludes ``a duty arising from participation in a voluntary Federal 
program,'' unless the regulation ``relates to a then-existing Federal 
program under which $500,000,000 or more is provided annually to State, 
local, and Tribal governments under entitlement authority,'' if the 
provision would ``increase the stringency of conditions of assistance'' 
or ``place caps upon, or otherwise decrease, the Federal Government's 
responsibility to provide funding,'' and the State, local, or Tribal 
governments ``lack authority'' to adjust accordingly. At the time of 
enactment, these entitlement programs were: Medicaid; Aid to Families 
with Dependent Children work programs; Child Nutrition; Food Stamps; 
Social Services Block Grants; Vocational Rehabilitation State Grants; 
Foster Care, Adoption Assistance, and Independent Living; Family 
Support Welfare Services; and Child Support Enforcement. ``Federal 
private sector mandate'' includes a regulation that ``would impose an 
enforceable duty upon the private sector, except (i) a condition of 
Federal assistance or (ii) a duty arising from participation in a 
voluntary Federal program.''
    The designation of critical habitat does not impose a legally 
binding duty on non-Federal Government entities or private parties. 
Under the Act, the only regulatory effect is that Federal agencies must 
ensure that their actions do not destroy or adversely modify critical 
habitat under section 7. While non-Federal entities that receive 
Federal funding, assistance, or permits, or that otherwise require 
approval or authorization from a Federal agency for an action, may be 
indirectly impacted by the designation of critical habitat, the legally 
binding duty to avoid destruction or adverse modification of critical 
habitat rests squarely on the Federal agency. Furthermore, to the 
extent that non-Federal entities are indirectly impacted because they 
receive Federal assistance or participate in a voluntary Federal aid 
program, the Unfunded Mandates Reform Act would not apply, nor would 
critical habitat shift the costs of the large entitlement programs 
listed above onto State governments.
    (2) We do not believe that this rule will significantly or uniquely 
affect small governments because the lands being designated for 
critical habitat are owned by private landowners, the States of New 
Mexico and Arizona, and the Federal Government (USFS, NPS, BLM, and 
Service). In addition, based in part on an analysis conducted for the 
previous proposed designation of critical habitat and extrapolated to 
this designation, we do not expect this rule to significantly or 
uniquely affect small governments. Small governments will be affected 
only to the extent that any

[[Page 58512]]

programs or actions requiring or using Federal funds, permits, or other 
authorized activities must ensure that their actions will not adversely 
affect the critical habitat. Further, we do not believe that this rule 
will significantly or uniquely affect small governments because it will 
not produce a Federal mandate of $100 million or greater in any year, 
that is, it is not a ``significant regulatory action'' under the 
Unfunded Mandates Reform Act. The designation of critical habitat 
imposes no obligations on State or local governments. Therefore, a 
Small Government Agency Plan is not required.

Takings--Executive Order 12630

    In accordance with E.O. 12630 (Government Actions and Interference 
with Constitutionally Protected Private Property Rights), we have 
analyzed the potential takings implications of designating critical 
habitat for the narrow-headed gartersnake in a takings implications 
assessment. The Act does not authorize the Service to regulate private 
actions on private lands or confiscate private property as a result of 
critical habitat designation. Designation of critical habitat does not 
affect land ownership, or establish any closures, or restrictions on 
use of or access to the designated areas. Furthermore, the designation 
of critical habitat does not affect landowner actions that do not 
require Federal funding or permits, nor does it preclude development of 
habitat conservation programs or issuance of incidental take permits to 
permit actions that do require Federal funding or permits to go 
forward. However, Federal agencies are prohibited from carrying out, 
funding, or authorizing actions that would destroy or adversely modify 
critical habitat. A takings implications assessment has been completed 
and concludes this designation of critical habitat for the narrow-
headed gartersnake does not pose significant takings implications for 
lands within or affected by the designation.

Federalism--Executive Order 13132

    In accordance with E.O. 13132 (Federalism), this rule does not have 
significant Federalism effects. A federalism summary impact statement 
is not required. In keeping with Department of the Interior and 
Department of Commerce policy, we requested information from, and 
coordinated development of this critical habitat designation with, 
appropriate State resource agencies. From a federalism perspective, the 
designation of critical habitat directly affects only the 
responsibilities of Federal agencies. The Act imposes no other duties 
with respect to critical habitat, either for States and local 
governments, or for anyone else. As a result, the final rule does not 
have substantial direct effects either on the States, or on the 
relationship between the national government and the States, or on the 
distribution of powers and responsibilities among the various levels of 
government. The final designation may have some benefit to these 
governments because the areas that contain the features essential to 
the conservation of the species are more clearly defined, and the 
physical or biological features of the habitat necessary for the 
conservation of the species are specifically identified. This 
information does not alter where and what federally sponsored 
activities may occur. However, it may assist State and local 
governments in long-range planning because they no longer have to wait 
for case-by-case section 7 consultations to occur.
    Where State and local governments require approval or authorization 
from a Federal agency for actions that may affect critical habitat, 
consultation under section 7(a)(2) of the Act will be required. While 
non-Federal entities that receive Federal funding, assistance, or 
permits, or that otherwise require approval or authorization from a 
Federal agency for an action, may be indirectly impacted by the 
designation of critical habitat, the legally binding duty to avoid 
destruction or adverse modification of critical habitat rests squarely 
on the Federal agency.

Civil Justice Reform--Executive Order 12988

    In accordance with Executive Order 12988 (Civil Justice Reform), 
the Office of the Solicitor has determined that the rule will not 
unduly burden the judicial system and that it meets the requirements of 
sections 3(a) and 3(b)(2) of the Order. We are designating critical 
habitat in accordance with the provisions of the Act. To assist the 
public in understanding the habitat needs of the species, this rule 
identifies the physical or biological features essential to the 
conservation of the narrow-headed gartersnake. The designated areas of 
critical habitat are presented on maps, and the rule provides several 
options for the interested public to obtain more detailed location 
information, if desired.

Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.)

    This rule does not contain information collection requirements, and 
a submission to the Office of Management and Budget (OMB) under the 
Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.) is not 
required. We may not conduct or sponsor and you are not required to 
respond to a collection of information unless it displays a currently 
valid OMB control number.

National Environmental Policy Act (42 U.S.C. 4321 et seq.)

    It is our position that, outside the jurisdiction of the U.S. Court 
of Appeals for the Tenth Circuit, we do not need to prepare 
environmental analyses pursuant to the NEPA in connection with 
designating critical habitat under the Act. We published a notice 
outlining our reasons for this determination in the Federal Register on 
October 25, 1983 (48 FR 49244). This position was upheld by the U.S. 
Court of Appeals for the Ninth Circuit (Douglas County v. Babbitt, 48 
F.3d 1495 (9th Cir. 1995), cert. denied 516 U.S. 1042 (1996)). However, 
when the range of the species includes States within the Tenth Circuit, 
such as that of the narrow-headed gartersnake, under the Tenth Circuit 
ruling in Catron County Board of Commissioners v. U.S. Fish and 
Wildlife Service, 75 F.3d 1429 (10th Cir. 1996), we undertake a NEPA 
analysis for critical habitat designation.
    We performed the NEPA analysis, and the draft environmental 
assessment was made available for public comment with publication of 
the revised proposed critical habitat designation (85 FR 23608; April 
28, 2020). We invited the public to comment on the extent to which the 
proposed critical habitat designation may have a significant impact on 
the human environment, or fall within one of the categorical exclusions 
for actions that have no individual or cumulative effect on the quality 
of the human environment. We received five comments during the comment 
period for the environmental assessment. Our environmental assessment 
found that the impacts of the revised proposed critical habitat 
designation would be minor and not rise to a significant level, so 
preparation of an environmental impact statement is not required. The 
final environmental assessment and finding of no significant impact has 
been completed and is available for review with the publication of this 
final rule. You may obtain a copy of the final environmental assessment 
online at http://www.regulations.gov, by contacting the Field 
Supervisor of the (see FOR FURTHER INFORMATION CONTACT), or on the 
Service's website at https://www.fws.gov/southwest/es/arizona/.

[[Page 58513]]

Government-to-Government Relationship With Tribes

    In accordance with the President's memorandum of April 29, 1994 
(Government-to-Government Relations with Native American Tribal 
Governments; 59 FR 22951), Executive Order 13175 (Consultation and 
Coordination with Indian Tribal Governments), and the Department of the 
Interior's manual at 512 DM 2, we readily acknowledge our 
responsibility to communicate meaningfully with recognized Federal 
Tribes on a government-to-government basis. In accordance with 
Secretarial Order 3206 of June 5, 1997 (American Indian Tribal Rights, 
Federal-Tribal Trust Responsibilities, and the Endangered Species Act), 
we readily acknowledge our responsibilities to work directly with 
Tribes in developing programs for healthy ecosystems, to acknowledge 
that Tribal lands are not subject to the same controls as Federal 
public lands, to remain sensitive to Indian culture, and to make 
information available to Tribes. We directly contacted GRIC, the White 
Mountain Apache Tribe, and the San Carlos Apache Tribe during the 
rulemaking process. We will continue to work on a government-to-
government basis with Tribal entities on conservation of habitat after 
the designation of critical habitat for the narrow-headed gartersnake.

References Cited

    A complete list of references cited in this rulemaking is available 
on the internet at http://www.regulations.gov and upon request from the 
Arizona Ecological Services Field Office (see FOR FURTHER INFORMATION 
CONTACT).

Authors

    The primary authors of this final rule are the staff members of the 
Fish and Wildlife Service's Species Assessment Team and the Arizona 
Ecological Services Field Office.

List of Subjects in 50 CFR Part 17

    Endangered and threatened species, Exports, Imports, Reporting and 
recordkeeping requirements, Transportation.

Regulation Promulgation

    Accordingly, we amend part 17, subchapter B of chapter I, title 50 
of the Code of Federal Regulations, as set forth below:

PART 17--ENDANGERED AND THREATENED WILDLIFE AND PLANTS

0
1. The authority citation for part 17 continues to read as follows:

    Authority: 16 U.S.C. 1361-1407; 1531-1544; and 4201-4245, unless 
otherwise noted.

0
2. Amend Sec.  17.11(h), the List of Endangered and Threatened 
Wildlife, by revising the entry for ``Gartersnake, narrow-headed'' 
under REPTILES to read as follows:


Sec.  17.11  Endangered and threatened wildlife.

* * * * *
    (h) * * *

----------------------------------------------------------------------------------------------------------------
                                                                                               Listing citations
           Common name              Scientific name      Where listed           Status          and applicable
                                                                                                     rules
----------------------------------------------------------------------------------------------------------------
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------
                                                    REPTILES
----------------------------------------------------------------------------------------------------------------
 
                                                  * * * * * * *
Gartersnake, narrow-headed......  Thamnophis          Wherever found....  T.................  79 FR 38678, 7/8/
                                   rufipunctatus.                                              2014; 50 CFR
                                                                                               17.95(c).\CH\
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------


0
3. Amend Sec.  17.95(c) by adding an entry for ``Narrow-headed 
Gartersnake (Thamnophis rufipunctatus)'' immediately following the 
entry for ``American Crocodile (Crocodylus acutus)'' to read as 
follows:


Sec.  17.95  Critical habitat--fish and wildlife.

* * * * *
    (c) * * *
* * * * *
    Narrow-headed Gartersnake (Thamnophis rufipunctatus)
    (1) Critical habitat units are depicted for Greenlee, Apache, 
Yavapai, Gila, and Coconino Counties in Arizona, as well as in Grant, 
Hidalgo, and Catron Counties in New Mexico, on the maps in this entry.
    (2) Within these areas, the physical or biological features 
essential to the conservation of narrow-headed gartersnake consist of 
the following components:
    (i) Perennial streams or spatially intermittent streams that 
provide both aquatic and terrestrial habitat that allows for 
immigration, emigration, and maintenance of population connectivity of 
narrow-headed gartersnakes and contain:
    (A) Pools, riffles, and cobble and boulder substrate, with a low 
amount of fine sediment and substrate embeddedness;
    (B) Organic and natural inorganic structural features (e.g., cobble 
bars, rock piles, large boulders, logs or stumps, aquatic vegetation, 
vegetated islands, logs, and debris jams) in the stream channel for 
basking, thermoregulation, shelter, prey base maintenance, and 
protection from predators;
    (C) Water quality that meets or exceeds applicable State surface 
water quality standards; and
    (D) Terrestrial habitat up to 328 feet (100 meters) from the active 
stream channel (water's edge) that includes flood debris, rock piles, 
and rock walls containing cracks and crevices, small mammal burrows, 
downed woody debris, and streamside vegetation (e.g., alder, willow, 
sedges, and shrubs) for thermoregulation, shelter, brumation and 
protection from predators throughout the year.
    (ii) Hydrologic processes that maintain aquatic and riparian 
habitat through:
    (A) A natural flow regime that allows for periodic flooding, or if 
flows are modified or regulated, a flow regime that allows for the 
movement of water, sediment, nutrients, and debris through the stream 
network, as well as maintenance of native fish populations; and
    (B) Physical hydrologic and geomorphic connection between the 
active stream channel and its adjacent terrestrial areas.

[[Page 58514]]

    (iii) A combination of native fishes, and soft-rayed, nonnative 
fish species such that prey availability occurs across seasons and 
years.
    (iv) An absence of nonnative aquatic predators, such as fish 
species of the families Centrarchidae and Ictaluridae, American 
bullfrogs (Lithobates catesbeianus), and/or crayfish (Orconectes 
virilis, Procambarus clarki, etc.), or occurrence of these nonnative 
species at low enough levels such that recruitment of narrow-headed 
gartersnakes is not inhibited and maintenance of viable prey 
populations is still occurring.
    (v) Elevations of 2,300 to 8,200 feet (700 to 2,500 meters).
    (3) Critical habitat does not include manmade structures (such as 
buildings, aqueducts, runways, roads, and other paved areas) and the 
land on which they are located existing within the legal boundaries on 
November 22, 2021.
    (4) Data layers defining map units were created using the U.S. 
Geological Survey's 7.5' quadrangles, National Hydrography Dataset and 
National Elevation Dataset; the Service's National Wetlands Inventory 
dataset; and aerial imagery from Google Earth Pro. Line locations for 
lotic streams (flowing water) and drainages are depicted as the 
``Flowline'' feature class from the National Hydrography Dataset 
geodatabase. The active channel along a stream is depicted as the 
``Wetlands'' feature class from the Service's National Wetlands 
Inventory dataset. Any discrepancies between the ``Flowline'' and 
``Wetlands'' feature classes were resolved using aerial imagery from 
Google Earth Pro. Elevation range is masked using the ``Elev_Contour'' 
feature class of the National Elevation Dataset. The administrative 
boundaries for Arizona and New Mexico were obtained from the Arizona 
Land Resource Information Service and New Mexico Resource Geographic 
Information System, respectively. This includes the most current (as of 
November 22, 2021) geospatial data available for land ownership, 
counties, States, and streets. Locations depicting critical habitat are 
expressed as decimal degree latitude and longitude in the World 
Geographic Coordinate System projection using the 1984 datum (WGS84). 
The maps in this entry, as modified by any accompanying regulatory 
text, establish the boundaries of the critical habitat designation. The 
coordinates or plot points or both on which each map is based are 
available to the public at the Service's internet site at http://www.fws.gov/southwest/es/arizona/, at http://www.regulations.gov at 
Docket No. FWS-R2-ES-2020-0011, and at the field office responsible for 
this designation. You may obtain field office location information by 
contacting one of the Service regional offices, the addresses of which 
are listed at 50 CFR 2.2.
    (5) Note: Index map follows:
    Figure 1 to Narrow-headed Gartersnake paragraph (5)
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[[Page 58515]]

[GRAPHIC] [TIFF OMITTED] TR21OC21.004

    (6) Unit 1: Upper Gila River Subbasin Unit, Grant and Hidalgo 
Counties, New Mexico.
    (i) Unit 1 consists of 7,005 acres (ac) (2,835 hectares (ha)) in 
Grant and Hidalgo Counties, and is composed of lands in Federal (4,084 
ac (1,653 ha)), State (553 ac (224 ha)), and private (2,368 ac (958 
ha)) ownership in eight subunits west of the town of Glenwood, north of 
Silver City, and South of Gila and Cliff.

[[Page 58516]]

    (ii) Map of Unit 1 follows:
    Figure 2 to Narrow-headed Gartersnake paragraph (6)(ii)
    [GRAPHIC] [TIFF OMITTED] TR21OC21.005
    
    (7) Unit 2: San Francisco River Subbasin Unit, Catron County, New 
Mexico.
    (i) Unit 2 consists of 5,895 ac (2,386 ha) in Catron County, and is 
composed of lands in Federal (3,924 ac (1,588 ha)), State (3 ac (1 
ha)), and private (1,967 ac (796 ha)) ownership in six subunits near 
the towns of Glenwood and Reserve.

[[Page 58517]]

    (ii) Map of Unit 2 follows:
    Figure 3 to Narrow-headed Gartersnake paragraph (7)(ii)
    [GRAPHIC] [TIFF OMITTED] TR21OC21.006
    
    (8) Unit 3: Blue River Subbasin Unit, Greenlee County, Arizona, and 
Catron County, New Mexico.
    (i) Unit 3 consists 3,368 ac (1,363 ha) in Greenlee County, 
Arizona, and Catron County, New Mexico, and is composed of lands in 
Federal (2,918 ac (1,181 ha)) and private (450 ac (182 ha)) ownership 
in three subunits near the towns of Blue, Arizona, and Luna, New 
Mexico.

[[Page 58518]]

    (ii) Map of Unit 3 follows:
    Figure 4 to Narrow-headed Gartersnake paragraph (8)(ii)
    [GRAPHIC] [TIFF OMITTED] TR21OC21.007
    
    (9) Unit 4: Eagle Creek Unit, Greenlee County, Arizona.
    (i) Unit 4 consists of 84 ac (34 ha) in Greenlee County, and is 
composed of lands in Federal (84 ac (34 ha)) and private (1 ac (<1 ha)) 
ownership near the town of Woolaroc.

[[Page 58519]]

    (ii) Map of Unit 4 follows:
    Figure 5 to Narrow-headed Gartersnake paragraph (9)(ii)
    [GRAPHIC] [TIFF OMITTED] TR21OC21.008
    
    (10) Unit 5: Black River Subbasin Unit, Apache and Greenlee 
Counties, Arizona.
    (i) Unit 5 consists of 1,780 ac (720 ha) in Apache and Greenlee 
Counties, and is composed of lands in Federal (1,780 ac (720 ha)) 
ownership in six subunits near the towns of Maverick and Hannigan 
Meadow.

[[Page 58520]]

    (ii) Map of Unit 5 follows:
    Figure 6 to Narrow-headed Gartersnake paragraph (10)(ii)
    [GRAPHIC] [TIFF OMITTED] TR21OC21.009
    
    (11) Unit 6: Canyon Creek Unit, Gila County, Arizona.
    (i) Unit 6 consists of 204 ac (82 ha) in Gila County, and is 
composed of lands in Federal (204 ac (82 ha)) ownership southwest of 
the town of Heber.

[[Page 58521]]

    (ii) Map of Unit 6 follows:
    Figure 7 to Narrow-headed Gartersnake paragraph (11)(ii)
    [GRAPHIC] [TIFF OMITTED] TR21OC21.010
    
    (12) Unit 7: Tonto Creek Subbasin Unit, Gila County, Arizona.
    (i) Unit 7 consists of 2,293 ac (928 ha) in Gila County, and is 
composed of lands in Federal (2,176 ac (881 ha)) and private (117 ac 
(47 ha)) ownership in three subunits near the towns of Jakes Corner and 
Gisela.

[[Page 58522]]

    (ii) Map of Unit 7 follows:
    Figure 8 to Narrow-headed Gartersnake paragraph (12)(ii)
    [GRAPHIC] [TIFF OMITTED] TR21OC21.011
    
    (13) Unit 8: Verde River Subbasin Unit, Coconino and Yavapai 
Counties, Arizona.
    (i) Unit 8 consists of 3,156 ac (1,277 ha) in Coconino and Yavapai 
Counties, and is composed of lands in Federal (2,446 ac (990 ha)), 
State (109 ac (44 ha)), and private (602 ac (244 ha)) ownership in 
three subunits near the towns of Sedona and Perkinsville.

[[Page 58523]]

    (ii) Map of Unit 8 follows:
    Figure 9 to Narrow-headed Gartersnake paragraph (13)(ii)
    [GRAPHIC] [TIFF OMITTED] TR21OC21.012
    
BILLING CODE 4333-15-C
* * * * *

Martha Williams,
Principal Deputy Director, Exercising the Delegated Authority of the 
Director, U.S. Fish and Wildlife Service.
[FR Doc. 2021-20962 Filed 10-20-21; 8:45 am]
BILLING CODE 4333-15-P