[From the U.S. Government Printing Office, www.gpo.gov]




                                MacMILLAN ASSOCIATES, INC. CONSULTING ENGINEERS
                                4101 NORTH EUCLID AVENUE                          BAY CITY, MICHIGAN 48706






















                                                                                FEASIBILITY STUDY

                                                                                                  FOR

                                                             STABILIZATION AND PRESERVATION

                                                                                              OF THE

                                                                              DAVIDSON DRY DOCK

                                                                      VETERANS MEMORIAL PARK

                                                                                            FOR THE

                                                                     CITY OF BAY CITY, MICHIGAN






















                                (517) 684-4060  (313) 232-7230  FACSIMILE (517) 684-5581



























         RECENVED

            SEP 2 5 1992

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                                             FEASIBILITY STUDY

                                                     FOR

                                    STABILIZATION AND PRESERVATION

                                                   OF THE

                                            DAVIDSON DRY DOCK

                                        VETERANS MEMORIAL PARK

                                                   FORTHE

                                        CITY OF BAY CITY, MICHIGAN


















                                                                                       Prepared by:
                                                                              Richard H. Lyon, P.E.
      9                                                                  MacMillan Associates, Inc.
                                                                             4101 N. Euclid Avenue
                                                                                 Bay City, MI 48706

                                                                            MAI Project No. 230805

                                                                               September 14, 1992

     (17




DAVIDSON DRY DOCK							September 14, 1992
CITY OF BAY CITY									Page 2


					TABLE OF CONTENTS


Purpose

Introduction

Condition of Existing Structures

		Summary

		Conclusion

Recommendations
	
		Use

		Stabilization and Preservation

		Cost

Appendix

	Exhibit #1 - Location Plan

	Exhibit #2 - Underwaster Inspection Field Notes

	Exhibit #3 - Historic Photograph

	Exhibit #4 - Photographs of Existing Condition

	Exhibit #5 - Plan - Proposed Preservation Scheme

	Exhibit #6 - Section - Proposed Preservation Scheme

	Exhibit #7 - Cost Estimate


			This document was prepared in part throuth financial
			assistance provided by the Office of Ocean and
			Coastal Resource Management, National Oceanic
			and Atmospheric Administration authorized by
			the Coastal Zone Management Act of 1972.




             DAVIDSON DRY DOCK                                                      September 14, 1992
             ar(OF BAY CITY                                                                        Page 3


             PURPOSE

             The purpose of this report is to study the present condition and usage of the Davidson
             Dry Dock, and provide recommendations for it's stabilization, preservation and future
             utifization.

             INTRODUCTION

             The Davidson Dry Dock, located within the Veterans Memorial Park, is the last vestige of
             the wooden ship building industry that was an important factor in economic growth and
             prosperity of Bay City, Michigan in the late 1800's and early 1900's.
             The dry dock was completed in November of 1900 and was used throughout the years
             for the repair and rebuilding of wooden ships. The dry dock was last used in 1931.
             The, dry dock is 455 feet long and 80 feet wide, with a width of 60 feet at the entrance. As
             constructed, the depth of the water in the dry dock was between 14 and 6 feet, depend-
             ing on the water level of the Saginaw River. The dry dock could be filled in 1 1/2 hours,
             andl pumped dry in under 2 hours.
             The dry dock is located in the south portion of the Veterans Memorial Park o     n the west
             bank of the Saginaw River in Bay City, Michigan. In recent years, the park has seen
             extensive renovation with construction of the Kantzler Arboretum, the construction of the
             Riverwalk Fishing Pier, and the construction of the Liberty Harbor Municipal Marina.
             Stabilization of the riverbank through utilization of sheet piling and riprap, ancl construc-
             tion of paved walking and jogging tracks is ongoing. A large storm sewer pipe dis-
             chcarges into the dry dock on the west end.

             CONDITION OF EXISTING STRUCTURES

             Tho commercial diving division of Townsend and Bottom Services Group, Inc. was re-
             tairied to perform a visual and tactile inspection of the condition of the.Davidson Dry
             Dock. On May 22, 1992, this inspection was accomplished and was recorded on
             audio/video tape. The quality of the visual portion is poor due to the extreme turbidity of
             the water in the dry dock.
             A summary of the audio portion of the inspection is included in the appendix of this
             report, Exhibit #2.

             SUMMAR

             The following summarizes the conditions which were observed by the diving team during
             the inspection:
             1.    The gate of the dry dock has not been operable for many years, but remains
                   across the entrance. The gate was constructed of wood and the top has deterio-
                   rated considerably. The gate is leaning into the dry dock, and normally is not visi-
                   ble.

             2.    The bottom of the dry dock has filled with sand, silt and debris. The water is
                   presently about seven to eight feet deep, versus the original depth of fourteen to
                   sixteen feet deep. The bottom surface is very loose and easily disturbed.





             DAVIDSON DRY DOCK                                                       September 14, 1992
             CIT(OF BAY CITY                                                                       Page 4


             3.    It appears the dry dock was originally constructed of wood, and later a non-
                   reinforced concrete topping and cap was applied. The wood portions were found
                   to be deteriorated at all depths, and in many areas the concrete has cracked and
                   fallen away.
             4.    The concrete cap has cracked into blocks, and in some areas has fallen into the
                   dry dock.
             5.    There is visual evidence that the soil around the dry dock has settled causing the
                   dry dock walls to settle and translate, resulting in the top of the dry dock wall to be
                   underwater.

             Exhibit #4 presents photos which document the present condition of the visible portion
             of the dry dock.

             CONCLUSIO

             There are many external forces acting on the dry dock structure Which have caused the
             deterioration noted. The park areas around the dry dock have been backfilled creating
             soil surcharge loads. Ice, water, and the freeze/thaw cycle of many winters has promot-
             ed deterioration of the concrete surfaces. The continual exposure to water has deterio-
             rated the structure of the wood. The lack of maintenance for approximately 60 years has
             allowed the external forces to deteriorate the dry dock un-checked.
             The dry dock will continue to deteriorate due to the external forces discussed. The area
             immediately adjacent to the dry dock poses a hazard to persons, due to the unevenness
             of the grade and the condition of the concrete cap.
             The condition of the concrete and wood is such that repair is not practical. A complete
             re-building from new materials would be the only alternative to resore the appearance to
             it's original condition.
             The walls of the dry dock are at a slope of approximately 600 from horizontal. The sur-
             face of the water in the dry dock is normally within three feet from the top of the sloping
             walls. Under extreme conditions, the water surface would be six feet below the top of
             the walls.

             In it's present condition, we feel that catastrophic failure of the dry dock walls should not
             occur, due to balancing of the soil and hydrostatic pressures on either sides of the wall.
             We would expect the concrete cap, wall alignment and top elevation to continue to move
             and subside. The dry dock can remain with no repairs; however, the areas adjacent to
             the water are a hazard that should be resolved.

             The dry dock must remain open for the discharge of storm water from the storm sewer
             which empties into the west end of the dry dock.

             RE-COMMENDATIONS

             The historical value of the dry dock is an asset to the community. The dry dock is on the
             Michigan Register of Historic Sites. Stabilization and preservation of the dry dock should
             be) undertaken to better utilize the potential of the area for recreational purposes.





            DAVIDSON DRY DOCK                                                    September 14, 1992
            CITY OF BAY CITY                                                                   Page 5


            Use

            Possible uses of the dry dock include:

            I .   Site for a museum vessel.
            2.    Stilling pond for radio controlled model boating.
            3.    Fishing, primarily adapted for the handicap.
            4.    A continuation of the Riverwalk system for relaxation and recreation.
            5.    For historic and educational markers to depict and explain how a dry dock func-
                  tioned ninety years ago.

            Stabilizatio -4 Preservatio

            We recommend the dry dock structure be preserved and stabilized in it's present condi-
            tion. To achieve this, the following construction is required:
            1 .   A concrete grade beam installed beyond the existing concrete cap, to allow backfill-
                  ing of the banks to remove the uneven grade which exists.
            2.    A "Boardwalk" constructed over piling, with a railing along the dry dock. This would
                  create a safe walking surface and keep pedestrians off of the concrete cap.
            3.    The configuration of the Boardwalk should be constructed to allow various usages,
                  such as model boating and fishing with complete handicap access.

            Coot

            A general preservation scheme is presented in Exhibits #5 and #6. We have estimated
            the cost of this scheme to be $ 565,000.00. A breakdown of the cost is outlined in Exhib-
            it #7.






            File: 230805.004











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                                                                                              EXHIBIT #2
                                                                                              Page 1 of.2

                                   FIELD NOTES - UNDERWATER INSPECTION

              Project:      Davidson Dry Dock                                         Job No.:      230805
              Client:       City of Bay City                                           Date:       5/22/92
              By:           Douglas F. Reckinger, P.E.
              9:30    Entered water at northwest corner adjacent to storm outlet, heating east while
                      crossing the dry dock.
                      Low visibility.
                      Outlet 3 1/2' H x 6'W.
                      There is a filter on bottom of an adjacent intake pipe.
                      Concrete in good condition.

                      Vertical wood members are rotten.
                      Sift at the bottom is tight.
                      Wood terminates into sift 7' below the water surface.
                      Loose sift at the middle of the dry dock.

              9:4.2.  Wood pallet found.
                      Flat bottom occurs 4' - 5' from the edge of the dry dock (40' from west end of dry
                      dock) approximate 7' deep.
                      3' silt at middle of dry dock, can't feel hard bottom.
                      One vertical wood section is rotted away, loose concrete behind.
                      Wood terminates into concrete at base.

              9:58    Plank 2x6' at bottom, parallel with wall, 6' long.
                      Horizontal pieces of wood connected to vertical wood, 2 - 3 planks.
                      Rock and gravel bottom (80' from west end of dry dock).
                      South side-horizontal plank at bottom..
              10:11   Chain found, 2" - 3" links, attached to bottom?? Gravel/sand.
                      Loose pipe.
                      Cement chunks at bottom (100'from west end).
                      Pole pushed down thru silt - no bottom detected at the middle.
                      Rock 6'- 7'tall? No, cement broken out from wall. Lumber on side, 3'from
                      surface.
                      Concrete top or curb which may have fallen in, 10'from N. wall.
                      Wall O.K. in area of rock
                      Base is 10' out. 5 horizontal members.

                      Vertical on top of horizontal wood (vertical wood member to the dry dock side of
                      the horizontal member).
                      Horizontal members on top (horizontal wood members to the dry dock side of the
                      vertical member).
                      Chain at horizontal on top of vertical.
                      Horizontal on both sides of vertical wood members.

              10:38   Horizontal members rotted, board members, closest to surface
                      Rebar,1/4 rod. Stray piece.
                      130'from west end. Horizontal members buried.
                      South side 130' out. Horizontal wood members in good shape, (6 good mem-
                      bers).







                                                                                         EXHIBIT #2
                                                                                         Page 2 of 2

            11:00  Break

            12:15  Second dive. 80' from the east end of the dry dock, there is a 1, to 2' gap between
                   the vertical timbers and the wall. This occurs at a 60' section at the south wall,
                   and a much longer area at the north. (Soil at the waters edge is significantly lower
                   in these areas than at surrounding areas).
            12:150 Concrete stepped retaining wall - 8' deep water.
            1:016; Same concrete wall at the south regarding stepped wall.
                   Steps 4 fingers wide 6" - 10" high.
                   Vertical planks; 12'- 15'ea.
                   1' wide cement, another wall - 8" wide another wall - on top of wood. Stepping
                   arrangement along the wall.

            1:20   Top of gate? Huge bolts.
                   Laying at 350 angle pointing to the west.
                   Bolts leaning to west.

                   Bolts at 8' o. c.
                   Framing members at top of the gate.
                   Top 6 1/2'- 7'wide.
                   4' wall to the end of the gate.

            1:55   Second dive completed.

            2:50   Third dive.
                   Stepping at middle of wood section.
                   Step at west end wood area.

                   Scoured under concrete 50' west of steel at south wall.

                   South wall 10' west of decay at mid-wall (settled soil above).
            3:30   Diving completed.


            File: 230805.003








                                                                                                 EXHIBIT #3




                                                                                             Historical Photo
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                                                                                          Looking Northwest









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                                                                                                                                                                                                                                 EXHIBIT #4
                                                                                                                                                                                                                                     Page 1 of 3




                                                                                                                                                                                                                                    North Bank
                                                                                                                                                                                                                 Looking Southwest










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                                                                                                                                                                                                                                     North Bank
                                                                                                                                                                                                                  Looking Southeast
                                                                                                                            77 1 J-5- @ " I







                                                                                EXHIBIT #4
                                                                              T..--Page2of3


















                        Concrete Cap and Deteriorated Vertical Timber, North Bank







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                        North Bank Looking East                    North Bank Looking West








                                                                                  EXHIBIT #4
                                                                                             .3
                                                                                   Page 3 of









                                                                                   South Bank
                                                                                Looking South



















                                                                                    North Bank
                                                                                 Looking South
                                                                     Deteriorated Concrete Cap















                                                                                    North Bank
                                                                                 Looking South
                                                                      Deteriorated Concrete Cap




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                                                 in                                                                                           CONSULTING ENGINEERS
         0n                                      wo DAVIDSON PRYPOCoK F                                 SERVATION 4101 NORTH EUCUD AVENUE BAY ClTY, MICHIGAN 48706
                                           <     -<                                                                            1(517)684-406OA313)232 7230/ FAX (517)684-5581








                                                                                                EXHIBIT #7

                                                   COST ESTIMATE

                                       DAVIDSON DRY DOCK STABILIZATION

                                            VETERANS MEMORIAL PARK

             ITEM                                                                                   TOTA

             General Conditions                                                                    $ 40,000

             New Boardwalk

                    Site Preparation                                                   30,000

                    Concrete Grade Beam                                                40,000

                    Pipe Piles                                                         50,000

                    Walkway Deck and Handrail                                          165,000

                    Lighting                                                           20,000
                    Benches and Trash Recepticals                                      10.00

                                                                                                     315,000
             Drydock Gate
                    Remove Existing Gate-and Erect on New Display                      20,000

                    Install New Gate, Abutments                                        60,

                                                                                                       80,000
             New Concrete Sidewalks                                                                     4,000

             Miscelaneous

                    Landscaping                                                        20,000
                    Riprap                                                               9,000
                    Sheetpiling Cap                                                      2.

                                                                                                       31,000
             Design, Construction Engineering, Contingincies;                                         95.40
             Total                                                                                  $565,000







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