United States Government Publishing Office publisher pbl distributor dst United States Government Accountability Office Resources, Community, and Economic Development Division author aut Government Organization text government publication eng GAOREPORTS Legislative Agency Publications gao legislative 2010-08-12 U.S. Government Printing Office 1996-10-02 monographic deposited born digital 217 p. GA 1.13:RCED-97-12 https://www.govinfo.gov/app/details/GAOREPORTS-RCED-97-12 P0b002ee180393684 f:rc97012 DGPO 2010-08-12 2011-03-28 GAOREPORTS-RCED-97-12 machine generated eng fdlp REPORT GAOREPORTS-RCED-97-12 RCED-97-12 Dams Endangered species Environmental impact statements Flood control Fishes Wildlife conservation Environmental research Environmental policies Hydroelectric energy Water supply management Grand Canyon National Park (AZ) Colorado Colorado River Basin Colorado River Storage Project Bureau of Reclamation Adaptive Management Program Wyoming Salt River Project (AZ) Lake Powell (AZ/NV) Bureau of Reclamation Colorado River Simulation System Glen Canyon Dam (AZ) Arizona Nevada New Mexico Utah California Glen Canyon National Recreation Area (AZ) Chapter Report RCED

Since the Glen Canyon Dam, located in northern Arizona, was completed by the Bureau of Reclamation in 1963, it has been used to generate power during periods of high demand--commonly known as peaking power. The fluctuating releases of water associated with the dam's peaking power operations have raised concerns about the harmful effects such flows have on downstream areas, particularly the Grand Canyon. In 1989, the Bureau of Reclamation was directed to prepare an environmental impact statement that would reevaluate the Glen Canyon Dam's operations. The purpose of the reevaluation was to determine options for operating the dam that would minimize the harmful effects on the downstream environmental and recreational resources, as well as on Native American interests in the Glen and Grand canyons, while still allowing the dam to produce hydropower. The Bureau issued its final environmental impact statement in March 1995. This report examines (1) whether the Bureau's impact determinations were reasonable and (2) what concerns still exist about the Glen Canyon Dam's final environmental impact statement. https://www.govinfo.gov/content/pkg/GAOREPORTS-RCED-97-12/html/GAOREPORTS-RCED-97-12.htm https://www.govinfo.gov/content/pkg/GAOREPORTS-RCED-97-12/pdf/GAOREPORTS-RCED-97-12.pdf GAO/RCED-97-12 https://www.govinfo.gov/app/details/GAOREPORTS-RCED-97-12 Chapter Report GAO/RCED-97-12; Bureau of Reclamation: An Assessment of the Environmental Impact Statement on the Operations of the Glen Canyon Dam; Dams Endangered species Environmental impact statements Flood control Fishes Wildlife conservation Environmental research Environmental policies Hydroelectric energy Water supply management Grand Canyon National Park (AZ) Colorado Colorado River Basin Colorado River Storage Project Bureau of Reclamation Adaptive Management Program Wyoming Salt River Project (AZ) Lake Powell (AZ/NV) Bureau of Reclamation Colorado River Simulation System Glen Canyon Dam (AZ) Arizona Nevada New Mexico Utah California Glen Canyon National Recreation Area (AZ) Title 16 Section 1532et seq. Title 16 Section 1536 Title 16 Section 661et seq. 16 U.S.C. 1532et seq. 16 U.S.C. 1536 16 U.S.C. 661et seq. Title 42 Section 4321 Title 42 Section 4321et seq. 42 U.S.C. 4321 42 U.S.C. 4321et seq. Volume 104 Page 484 104 Stat. 484 Public Law 101-380 Public Law 102-575