751 24256DPL - Winchester Dam Rehabiliation - IFB.pdf

PDF 19 MB Posted Aug 14, 2026

Attached to: 751/24256. DPL; Mecosta County SGA - Winchester Dam Rehab
Solicitation number: RFQ 171 260000000421 4
Issued by: Michigan

About this file

Written by GovTribe AI · Aug 17, 2026

This is an Invitation for Bid (IFB) document for the Winchester Dam Rehabilitation project in Sheridan Township, Mecosta County, Michigan, prepared by GEI Consultants for the Michigan Department of Technology, Management, and Budget (DTMB) in coordination with the Michigan Department of Natural Resources (MDNR). The project addresses deteriorating infrastructure at Winchester Dam through multiple rehabilitation components, including lining the existing corrugated metal pipe (CMP) inlet and outlet with new high-density polyethylene (HDPE) pipe, replacing the sluice gate and operating components, installing trash racks and an operator walkway, installing upstream riprap for erosion protection, placing an aggregate filter blanket on the downstream embankment to improve seepage conditions, installing a riprap-lined stilling basin at the outlet to mitigate erosion, rehabilitating deteriorating primary spillway concrete, addressing leaking stoplogs and locking mechanisms, and completing auxiliary spillway rehabilitation and embankment improvements. The project is located on Martiny Lake in the West Branch Chippewa River watershed and includes comprehensive design plans with multiple sheets detailing existing conditions, proposed site plans, spillway designs, embankment sections, concrete repair specifications, erosion and sediment control measures, and auxiliary spillway details. The final report was issued on July 22, 2025, with design prepared by GEI Project No. 2407812.

The design documents establish vertical datum using the National American Vertical Datum of 1988 (NAVD88) and horizontal datum using North American Datum of 1983 (NAD83) Michigan State Plane coordinates. The project is subject to Michigan Department of Environment, Great Lakes and Energy (EGLE) rules and regulations, with substantive changes to approved drawings and specifications requiring EGLE approval. Contractors must verify all critical dimensions, locations, and elevations before proceeding, submit shop drawings for engineer review prior to fabrication, coordinate with 811 Miss-Dig One Call regarding subsurface utilities, and develop a comprehensive work plan including sequence of construction. Maximum surcharge load on the dam crest is limited to 200 pounds per square foot, with any proposed equipment or material exceeding this load requiring a submittal prepared and sealed by a Michigan-licensed professional engineer for owner and engineer approval. Temporary staging, storage, and access areas must be restored to original condition with grassed areas restored using seed and mulch, and contractors must provide appropriate signage and restrict public access to work areas.

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Other files

File	Type	Posted
Winchester Dam Addendum 4.pdf	PDF	Aug 14, 2026
Service Disabled Veteran Owned Business Info Sheet 2025.pdf	PDF	Aug 14, 2026
Wiinchester Dam Addendum 1.pdf	PDF	Aug 14, 2026
DTMB-0415 Advertisement - Mecosta County Dams.pdf	PDF	Aug 14, 2026
Winchester Dam Addendum 2.pdf	PDF	Aug 14, 2026
Winchester Dam Addendum 3.pdf	PDF	Aug 14, 2026
MICH Spec.pdf	PDF	Aug 14, 2026

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INTERSTATE

69INTERSTATE

INTERSTATE

Barry

Ottawa

Lake

Oscoda

Montmorency

Berrien

Gogebic

Washtenaw

Leelanau

Grand Traverse

Kalamazoo

Monroe

Clinton

Chippewa

Hillsdale

Benzie

Livingston

St. ClairShiawassee

Van Buren

Lenawee

Wayne

Sanilac

Ingham

Oakland

MissaukeeManistee

Muskegon

Luce

Roscommon

Jackson

Antrim

Cass

Eaton

Midland

Mackinac

Gratiot

Emmet

Arenac

Bay

Gladwin

Cheboygan

Branch

Osceola

Charlevoix

Houghton

Keweenaw

Allegan

Alcona

Presque Isle

Genesee

Marquette

Clare

Alpena

Menominee

Mason

Kalkaska

Lapeer

Isabella

Delta

BaragaOntonagon

Iron

St. Joseph

Saginaw Montcalm

Kent

Crawford

Wexford

Mecosta

Otsego

Calhoun

Oceana

Tuscola

Dickinson

Macomb

Newaygo

Alger

Schoolcraft

Ionia

Iosco

Huron

Ogemaw

WINCHESTER DAM STUDY PHASE EVALUATION

CONCEPTUAL ALTERNATIVES PLANS

MECOSTA COUNTY, MI

DEPARTMENT OF TECHNOLOGY, MANAGEMENT, AND BUDGET

SHERIDAN TOWNSHIP, MECOSTA COUNTY, MICHIGAN

THIS DOCUMENT, AND THE IDEAS AND DESIGNS INCORPORATED

HEREIN, IS AN INSTRUMENT OF PROFESSIONAL SERVICE, IS THE

PROPERTY OF GEI CONSULTANTS AND IS NOT TO BE USED, IN WHOLE

OR IN PART, FOR ANY OTHER PROJECT WITHOUT THE WRITTEN

AUTHORIZATION OF GEI CONSULTANTS.

STATE or COUNTY MAP

(NOT TO SCALE)

SITE LOCATION MAP

(NOT TO SCALE)

PREPARED FOR:

MICHIGAN DEPARTMENT OF

TECHNOLOGY, MANAGEMENT, AND

BUDGET (DTMB)

3111 WEST JOSEPH ST.

LANSING, MI

(517)241-5545

SITE

Consultants

PREPARED BY:

GEI CONSULTANTS OF MICHIGAN, P.C.

401 S. WASHINGTON SQUARE

SUITE 103

LANSING, MI 48933

(517)803-4600

SITE

GEI PROJECT NO. 2407812

SOURCE:

BING AERIAL

PROJECT OWNER:

MICHIGAN DEPARTMENT OF NATURAL

RESOURCES

28681 OLD NORTH RIVER ROAD

HARRISON TOWNSHIP, MI 48045

DEPARTMENT OF TECHNOLOGY, MANAGEMENT AND BUDGET

STATE OF MICHIGAN

ADAM P. LACH, RA, DIRECTOR

STATE FACILITIES ADMINISTRATION

DESIGN AND CONSTRUCTION DIVISION

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GEI CONSULTANTS OF MICHIGAN, P.C.

401 S. WASHINGTON SQUARE

SUITE 103

LANSING, MI 48933

(517)803-4600

Consultants

S T.

G , M

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) 2

-5

Attention:

0 1"

NO. DATE ISSUE/REVISION APP

0 7/22/2025 FINAL REPORT CG

If this scale bar does not measure 1" then drawing is not original scale.

SHEET NAME

A R

T O

C H

N O

Y, M

A N

A G

T, A

N D

B U

D G

P.E. No.:

Approved:

Checked:

Drawn:

Designed:

GEI Project:

T. Naperala C. Grundenmann

JRB/JPW

M. Carden 2407812

COVER SHEET

G-100DTMB FILE NUMBER: 751/24256.DPL

Sheet List Table Sheet Number Sheet Title

G-100 COVER SHEET

G-200 GENERAL NOTES AND LEGEND

G-300 EXISTING SITE CONDITIONS

G-310 EXISTING SPILLWAY CONDITIONS

EC-100 EROSION SEDIMENTS CONTROLS PLAN

EC-200 SOIL EROSION SEDIMENT CONTROLS

DETAILS

B-100 SOIL BORING AND WELL LOCATION

CW-100 CONTROL OF WATER

D-100 OVERALL DEMOLITION PLAN

C-100 PROPOSED SITE PLAN

C-110 PROPOSED SPILLWAY PLAN

C-200 PROPOSED EMBANKMENT SECTIONS

C-210 EMBANKMENT DETAILS

C-300 AUXILLIARY SPILWAY SECTIONS

C-310 AUXILLIARY SPILLWAY DETAILS

S-100 GENERAL NOTES

S-200 PRIMARY SPILLWAY DOWNSTREAM

ELEVATION

S-201 PRIMARY SPILLWAY LEFT WALL PROFILE

S-202 PRIMARY SPILLWAY RIGHT WALL PROFILE

S-210 CONCRETE REPAIR

S-300 AUXILLIARY SPILLWAY CONCRETE PLAN

S-310 AUXILLIARY SPILLWAY CONCRETE DETAILLS

LINETYPE LEGEND

EXISTING STORM PIPE AND STRUCTURES

SECTION / DETAIL

INDICATES DRAWING NUMBER ON

INDICATES SECTION DESIGNATION

ABBREVIATIONS

APP = APPROXIMATE

CMP = CORRUGATED METAL PIPE

CONC = CONCRETE

EX = EXISTING

EL = ELEVATION

FES = FLARED END SECTION

INV = INVERT

LF = LINEAR FOOT

PERF = PERFORATED

PROP = PROPOSED

STA = STATION

WSEL = WATER SURFACE ELEVATION

SYMBOLS LEGEND

CUT SLOPE

WHICH SECTION IS DRAWN

A C-03

FLOW DIRECTION

HATCH LEGEND

REQUIRED

DEMOLITION

PROPOSED

REPAIRS

PROPOSED

GROUND

SURFACE

RE-GRADED

SLOPE

PROPOSED

CONCRETE

SADDLE

NOTES:

· VERTICAL DATUM: NATIONAL AMERICAN VERTICAL DATUM OF 1988 (NAVD88).

· HORIZONTAL DATUM: NORTH AMERICAN DATUM OF 1983 (NAD83), MICHIGAN STATE PLANE,

SOUTH ZONE, INTERNATIONAL FOOT.

· PLAN VIEW ELEVATION DATA SOURCE: USGS LIDAR TOPOGRAPHY AND GPS SURVEY DATA.

· SECTION VIEW ELEVATION DATA SOURCE: USGS LIDAR TOPOGRAPHY AND GPS SURVEY

DATA.

· GPS SURVEY CONDUCTED BY GEI ENGINEER 11/12/24-11/13/24.

· THE APPROXIMATE WATER'S EDGE GENERATED USING GPS SURVEY DATA, USGS LIDAR

TOPOGRAPHY, AND GEOGRAPHIC MAPS.

PROPOSED

PLAIN RIPRAP

EXISTING

PLAIN RIPRAP

PROPOSED

HEAVY RIPRAP

EXISTING

GROUND

SURFACE

SAND PROPOSED

CONCRETE

EXISTING GRADE

STM

WET

WTR

100YR

? ESTIMATED EXISTING GRADE

PROPOSED STORM PIPE AND STRUCTURES

PROPOSED TEMPORARY COFFERDAMS

PROPOSED GRADE

100-YEAR STORM EVENT WATER SURFACE

WATER SURFACE ELEVATION

CONTOUR INTERVAL (1-FOOT)

CONTOUR INTERVAL (5-FOOT)

APPROXIMATE WATER'S EDGE

DELINEATED WETLAND BOUNDARY

NATIONAL WETLAND INDEX BOUNDARY

STATIONING ALIGNMENT

EXISTING FENCE LINE

XXX

VEGETATION

PHOTO ANGLE POINTX

EMBANKMENT

FILL

IMPERVIOUS

FILL

PROPOSED GRADE

WATER

SURFACE

PROPOSED

ALUMINUM

BEDDING STONE

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GEI CONSULTANTS OF MICHIGAN, P.C.

401 S. WASHINGTON SQUARE

SUITE 103

LANSING, MI 48933

(517)803-4600

Consultants

S T.

G , M

I 4

) 2

-5

Attention:

0 1"

NO. DATE ISSUE/REVISION APP

0 7/22/2025 FINAL REPORT CG

If this scale bar does not measure 1" then drawing is not original scale.

SHEET NAME

A R

T O

C H

N O

Y, M

A N

A G

T, A

N D

B U

D G

P.E. No.:

Approved:

Checked:

Drawn:

Designed:

GEI Project:

T. Naperala C. Grundenmann

JRB/JPW

M. Carden 2407812

GENERAL NOTES

AND LEGEND

G-200

GENERAL NOTES:

1. THESE NOTES SUPPLEMENT THE PROJECT SPECIFICATIONS. BEFORE BEGINNING CONSTRUCTION, THE CONTRACTOR SHALL VERIFY ALL CRITICAL DIMENSIONS, LOCATIONS, AND ELEVATIONS

BEFORE PROCEEDING WITH WORK. ANY DISCREPANCY FOUND AMONG THE DRAWINGS,

SPECIFICATIONS, THESE NOTES, AND THE SITE CONDITIONS SHALL BE REPORTED TO THE

OWNER'S REPRESENTATIVE (GEI), WHO SHALL CORRECT SUCH DISCREPANCY IN WRITING. ANY

WORK DONE BY THE CONTRACTOR AFTER DISCOVERY OF SUCH DISCREPANCY SHALL BE DONE AT

CONTRACTOR'S RISK.

2. THE CONTRACTOR SHALL SUBMIT SHOP DRAWINGS FOR ENGINEER REVIEW PRIOR TO

PROCEEDING WITH ANY WORK OF FABRICATION.

3. CONSTRUCTION IS SUBJECT TO THE RULES AND REGULATIONS OF THE MICHIGAN DEPARTMENT OF

ENVIRONMENT, GREAT LAKES AND ENERGY (EGLE). SUBSTANTIVE CHANGES TO THE APPROVED

DRAWINGS AND SPECIFICATIONS MAY REQUIRE EGLE APPROVAL.

4. PRIMARY SITE ACCESS TO THE PROJECT IS PROVIDED AS SHOWN ON SHEET EC-1.0.

5. THE SUBSURFACE UTILITY INFORMATION IN THESE DRAWINGS SHALL BE ASSUMED TO BE

APPROXIMATE. THE CONTRACTOR SHALL MAKE ANY NECESSARY INVESTIGATIONS AND

COORDINATION WITH THE 811 MISS-DIG ONE CALL PRIOR TO COMMENCEMENT OF ANY WORK

ACTIVITIES.

6. CONTRACTOR IS RESPONSIBLE FOR DEVELOPING AND IMPLEMENTING A SEQUENCE AND

SCHEDULE FOR COMPLETION OF THE WORK IN ACCORDANCE WITH APPLICABLE PROVISIONS OF

THE CONTRACT DOCUMENTS. THE CONTRACTOR SHALL SUBMIT THEIR WORK PLAN WHICH SHALL

INCLUDE THE PROPOSED SEQUENCE OF WORK.

7. TEMPORARY STAGING, STORAGE, STOCKPILE AND ACCESS AREAS SHALL BE WITHIN WORK LIMITS

AND RESTORED BY THE CONTRACTOR TO ORIGINAL CONDITION. ALL RESTORATION OF GRASSED

AREAS SHALL BE WITH SEED AND MULCH.

8. THE EXISTING TOPOGRAPHY HEREIN IS FOR INFORMATIONAL PURPOSES ONLY. THE ENGINEER AND OWNER ARE NOT RESPONSIBLE FOR ANY MISCHARTED OR UNCHARTED UTILITIES, OR OTHER

ERRORS DETECTED. IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO VERIFY ALL SITE

CONDITIONS.

9. EXISTING CONDITIONS SHOWN ON THE DRAWINGS ARE APPROXIMATE, ACTUAL FIELD CONDITIONS

MAY VARY. REFER TO REFERENCE DRAWINGS AND SPECIFICATIONS FOR ADDITIONAL

INFORMATION REGARDING EXISTING CONDITIONS.

10.LAKE WATER LEVEL VARIES. INDICATIONS OF WATER LEVELS SHOWN ON THE DRAWINGS MAY NOT

BE REPRESENTATIVE OF ACTUAL WATER LEVELS THAT MAY BE ENCOUNTERED DURING

PERFORMANCE OF WORK BY THE CONTRACTOR.

11.CONTRACTOR SHALL PROVIDE APPLICABLE SIGNAGE AND TEMPORARILY RESTRICT PUBLIC

ACCESS TO THE WORK AREAS.

12.MAXIMUM SURCHARGE LOAD ON CREST OF THE DAM SHALL BE LIMITED TO 200 PSF. IF THE

CONTRACTOR PROPOSES EQUIPMENT OR MATERIAL ON THE CREST IN EXCESS OF THE MAXIMUM

LOAD, A SUBMITTAL PREPARED AND SEALED BY A PROFESSIONAL ENGINEER LICENSED IN THE

STATE OF MICHIGAN SHALL BE PROVIDED TO THE OWNER AND ENGINEER FOR REVIEW AND

APPROVAL PRIOR TO THE START OF CONSTRUCTION.

COORDINATION:

1. SCHEDULE, COORDINATE, AND PERFORM THE WORK TO MEET THE OVERALL PROJECT SCHEDULE

CONSTRAINTS.

2. COORDINATE WITH THE OWNER FOR DESIGNATION OF SPECIFIC WORK AREAS FOR RESTRICTED ACCESS DURING PARTICULAR PERIODS OF THE WORK, AS WELL AS NEED FOR FENCING, SIGNAGE, AND OTHER MEASURES NECESSARY TO PROTECT THE PUBLIC, COMPLETED WORK, WORK IN

PROGRESS, AND CONTRACTOR'S EQUIPMENT AND PROPERTY ON SITE.

3. MAINTAIN FULL AND COMPLETE ACCESS TO WORK TO OWNER, ENGINEER, AND REGULATORY

PERSONNEL.

PERMITTING AND ENVIRONMENTAL:

1. COMPLY WITH ALL REQUIREMENTS OF OWNER-OBTAINED PROJECT PERMITS (EGLE).

CONTRACTOR SHALL OBTAIN ALL OTHER PERMITS NECESSARY FOR CONSTRUCTION OF THE

WORK. PROJECT PERMITS INCLUDE, BUT ARE NOT LIMITED TO, DTMB SESC, OAKLAND COUNTY, ETC.

SPACIAL DATUM INFORMATION:

1. VERTICAL: NATIONAL AMERICAN VERTICAL DATUM OF 1988 (NAVD88).

2. HORIZONTAL: NORTH AMERICAN DATUM OF 1983 (NAD83), MICHIGAN STATE PLANE, CENTRAL ZONE, INTERNATIONAL FOOT.

3. CONTROL MONUMENTS ON-SITE SHALL BE REFERRED TO CONFIRM HORIZONTAL AND VERTICAL

MEASUREMENTS.

EXISTING DATA SOURCES:

1. SITE TOPOGRAPHY LIDAR BY USGS 2017 AND GEI 2023 AND 2024.

2. BATHYMETRY OBTAINED FROM MDNR GIS OPEN DATA PORTAL 2023 AND GEI 2024.

3. AERIAL IMAGE BY OAKLAND COUNTY 2020 AND GEI 2023.

4. ORIGINAL CONSTRUCTION DRAWINGS OBTAINED FROM MDNR.

5. WETLAND DELINEATION PERFORMED BY GEI CONSULTANTS AUGUST 2023.

6. GEOTECHNICAL EXPLORATION CONDUCTED BY GEI CONSULTANTS JUNE 2023.

DESIGN STATEMENT:

1. PROPOSED WORK IS DESIGNED TO ADDRESS THE DETERIORATING CMP INLET AND OUTLET BY LINING THE EXISTING CMP WITH NEW HDPE PIPE, REPLACING THE SLUICE GATE AND OPERATING

COMPONENTS, TRASH RACKS AND OPERATOR WALKWAY, INSTALLING UPSTREAM RIP RAP FOR

EROSION PROTECTION, INSTALLING AN AGGREGATE FILTER BLANKET ON THE DOWNSTREAM

EMBANKMENT TO IMPROVE SEEPAGE OUTBREAKS, AND INSTALLING A RIP RAP LINED STILLING

BASIN AT THE OUTLET TO MITIGATE EROSION.

MECOSTA

DETERIORATING PRIMARY SPILLWAY CONCRETE, LEAKING STOPLOGS, STOPLOG LOCKING

MECHANISMS, REHABILITATION OF THE AUXILIARY SPILLWAY, AND EMBANKMENT

IMPROVEMENTS.

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WET

ETW

WET

0+00

4+50

FLO

990 992

08-005-017-000

MICHIGAN DEPT OF

NATURAL RESOURCES

47TH AVE

BARRYTON, MI 49305

MARTINY LAKE

WSEL: 993.46

11/12/24

EARTHEN AUXILIARY

SPILLWAY CHUTE

NWI WETLAND BOUNDARY

BRIDGE

CROSSING

GROUT PILLOW BLANKET LINED

AUXILIARY SPILLWAY CREST

PROPERTY LINE

DELINEATED WETLAND BOUNDARY

WSEL: 986.81

11/12/24

EX GRADE BELOW 996.60

WET

WETWET

WET

WET WET

WET

WETWET

WETWETWET

WET

WETWET

WET

WETWET

WET

WET WET

WET

WET WET

WET WET WET

WET

1+00

2+00

3+00

4+00

HARDING RD

EX 4" HDPE

TILE DRAIN

FLO

EX GRADE BELOW 996.60

BOAT LAUNCH

21'-0"

STM

50'-0"

WEST BRANCH

CHIPPEWA RIVER

1+83

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 17001020

200YR

WTR

EXISTING CONDITIONS

SCALE: 1" = 20'PLAN

AUXILLARY SPILLWAY EXISTING CONDITIONS

SECTION

SCALE: 1" = 10'

G-02

PHOTO 1

PHOTO 2

PHOTO 3

PHOTO 4

PHOTO 5

G-300

STOPLOG SLOT

CRACKING

SPALLING

EFFLORESCENCE

& CRACKING

SPALLING & CRACKING

EFFLORESCENCE

& CRACKING

CRACKING

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401 S. WASHINGTON SQUARE

SUITE 103

LANSING, MI 48933

(517)803-4600

Consultants

S T.

G , M

I 4

) 2

-5

Attention:

0 1"

NO. DATE ISSUE/REVISION APP

0 7/22/2025 FINAL REPORT CG

If this scale bar does not measure 1" then drawing is not original scale.

SHEET NAME

A R

T O

C H

N O

Y, M

A N

A G

T, A

N D

B U

D G

P.E. No.:

Approved:

Checked:

Drawn:

Designed:

GEI Project:

T. Naperala C. Grundenmann

JRB/JPW

M. Carden 2407812

EX GRADE

WSEL 986.81

11/12/24

DESIGN STORM

WSEL 995.60

NORMAL POOL

WSEL 993.50

EXISTING SITE

CONDITIONS

GRAVEL PARKING

A G-02

A' G-02

EX AUX SPILLWAY CREST EL 994.50

WET

WET W

WET

WET WET WET

WET

3+00

STM

EXISTING SPILLWAY

SCALE: 1" = 5'PLAN

G-310

Z, A

C :\U se rs

\a le sc h3

D C

\A C

C D oc s\

C on su lta nt s\

Pr oj ec t F ile s\

W in ch es te r D am

\0 0_

\D es ig n\

Sh ee ts \G

-3

G S

C O

N D

N S.

dw g

/3 0/

GEI CONSULTANTS OF MICHIGAN, P.C.

401 S. WASHINGTON SQUARE

SUITE 103

LANSING, MI 48933

(517)803-4600

Consultants

S T.

G , M

I 4

) 2

-5

Attention:

0 1"

NO. DATE ISSUE/REVISION APP

0 7/22/2025 FINAL REPORT CG

If this scale bar does not measure 1" then drawing is not original scale.

SHEET NAME

A R

T O

C H

N O

Y, M

A N

A G

T, A

N D

B U

D G

P.E. No.:

Approved:

Checked:

Drawn:

Designed:

GEI Project:

T. Naperala C. Grundenmann

JRB/JPW

M. Carden 2407812

EXISTING

SPILLWAY

CONDITIONS

GRAVEL PARKING

WET

ETW

WET

0+00

4+50

FLO

990 992

08-005-017-000

MICHIGAN DEPT OF

NATURAL RESOURCES

47TH AVE

BARRYTON, MI 49305

MARTINY LAKE

WSEL: 993.46

11/12/24

AUXILIARY SPILLWAY

NWI WETLAND BOUNDARY

BRIDGE

CROSSING

AUXILIARY

SPILLWAY

CREST

PROPERTY LINE

DELINEATED WETLAND BOUNDARY

WSEL: 986.81

11/12/24

EX GRADE BELOW 996.60

WET

WETWET

WET

WET WET

WET

WETWET

WETWETWET

WET

WETWET

WET

WET WET

WET

WET WET

WET WET WET

WET

1+00

2+00

3+00

4+00

HARDING RD

EX 4" HDPE

TILE DRAIN

FLO

EX GRADE BELOW 996.60

BOAT LAUNCH

21'-0"

STM

WEST BRANCH

CHIPPEWA RIVER

EROSION CONTROL

SCALE: 1" = 20'PLAN

EC-100

Z, A

C :\U se rs

\a le sc h3

D C

\A C

C D oc s\

C on su lta nt s\

Pr oj ec t F ile s\

W in ch es te r D am

\0 0_

\D es ig n\

Sh ee ts \E

C -1

R O

N S

C O

N .d w g

/3 0/

GEI CONSULTANTS OF MICHIGAN, P.C.

401 S. WASHINGTON SQUARE

SUITE 103

LANSING, MI 48933

(517)803-4600

Consultants

S T.

G , M

I 4

) 2

-5

Attention:

0 1"

NO. DATE ISSUE/REVISION APP

0 7/22/2025 FINAL REPORT CG

If this scale bar does not measure 1" then drawing is not original scale.

SHEET NAME

A R

T O

C H

N O

Y, M

A N

A G

T, A

N D

B U

D G

P.E. No.:

Approved:

Checked:

Drawn:

Designed:

GEI Project:

T. Naperala C. Grundenmann

JRB/JPW

M. Carden 2407812

EROSION

SEDIMENTS

CONTROLS PLAN

PLAN TO BE DEVELOPED.

FLOW

DIRECTION

3'-0" MAX.

EXISTING GROUND

BACKFILL AND

COMPACT TRENCH

WITH EXCAVATED SOIL

GEOTEXTILE FABRIC

WOOD POSTS 4'-0"

MIN. LENGTH 2'-0" MIN.

DEPTH IN GROUND

1"x1"x24"

WOOD STAKE

COMPACT EXCAVATED

SOIL ON BERM

CREST SIDE

SET WATTLE ROLL IN

2" - 3" DEEP TRENCH

12" MIN

INSTALL STAKE PERPENDICULAR

TO SLOPE FACE

2" -3

CONCRETE BLOCK AND PVC

COATED STEEL CABLE ANCHORS

CURTAINS IN POSITION

USCG

APPROVED

HAZARD BUOY

TIED TO

CONCRETE

BLOCK EVERY

40' TO MARK

SILT CURTAIN

AREA

5" PVC PIPE SEALED WITH WATERTIGHT ENDCAPS SUSPENDS

GEOTEXTILE FILTER FABRIC IN 20' SECTIONS.

SILT CURTAIN LENGTH VARIES WITH WATER DEPTH.

VERTICAL CURTAIN COVERAGE SHALL REMAIN

WITHIN 1' OF LAKEBOTTOM THROUGH USE OF TWO

ADJUSTABLE FURLING LINES ON EACH SECTION

LENGTH OF 516" BALLAST CHAIN,

RUNNING THROUGH A POCKET

ALONG BOTTOM OF CURTAIN

SECTIONS, ACTS AS A

STABILIZING WEIGHT.

BLANKETS/MATS INSTALLED

HORIZONTALLY ACROSS

SIDE SLOPES

TAMP SOIL OVER

MAT/BLANKET

3' (1 m)

12" (300 mm)

MIN OVERLAP

NOTES:

1. SLOPE SURFACE SHALL BE FREE OF ROCKS,

CLODS, STICKS AND GRASS. MATS/BLANKETS

SHALL HAVE GOOD SOIL CONTACT.

2. APPLY PERMANENT SEEDING BEFORE

PLACING BLANKETS.

3. LAY BLANKETS LOOSELY AND STAKE OR

STAPLE TO MAINTAIN DIRECT CONTACT WITH

THE SOIL. DO NOT STRETCH.

4. THE SOIL EROSION AND SEDIMENTATION

CONTROL PERMIT OBTAINED BY THE

CONTRACTOR FROM THE LOCAL GOVERNING

AGENCY SUPERSEDES THIS DETAIL.

TYPICAL PLAN

FLOW

4' M

PUBLIC ROAD

50' MIN

<2% SLOPE

SECTION A-A

EDGE OF

PUBLIC ROAD

ASTM NO. 2 STONE, 8" DEPTH

OVER GEOTEXTILE FABRIC

TEMPORARY DRAINAGE

PIPE WHERE NEEDED

20' R (MIN)

EXISTING

NATURAL

GROUND

GEOTEXTILE FABRIC SHALL BE PLACED

UNDER ENTIRE WIDTH OF STONETEMPORARY DRAINAGE

PIPE WHERE NEEDED

3" UNDERCUT PRIOR

TO PLACEMENT OF

STONE

50' MIN

' M

CLEAN WASHED STONE SIZES

FROM 2" TO 4", 8" DEPTH

GEOTEXTILE FABRIC SHALL BE PLACED

UNDER ENTIRE WIDTH OF STONE

8" MIN MDOT 23A

EX NATURAL GROUND

TIMBER MATS

PROVIDED BY CONTRACTOR

EX NATURAL GROUND

SOIL EROSION

SEDIMENT

CONTROLS

DETAILS

EC-200

BERM

ALL FABRIC FORMS

WILL BE

LAPPED IN AN

UPSTREAM TO

DOWNSTREAM

DIRECTION

MAX ANGLE

15 DEG.

FABRIC

FOLD

8 INCH

STEEL STAPLE CONSTRUCTION

FORM

DIRECTION OF FLOW

12" (300 mm)

1 12" (40 mm)

4' (1.2 m)

12" (300 mm)

FOLDING CONTINUOUS

SHEET FABRIC AT BENDS

SHEET FABRIC

AT BENDS

BERM STAPLES

NOTES:

1. ALL MATERIAL TO MEET SPECIFICATIONS.

2. PLACE ONE STAKE AT THE CENTER OF THE DITCH/CHANNEL. ALSO PLACE

STAKES AT THE BED/BANK JUNCTION AND AT END OF THE DEVICE NOT

SPACED MORE THAN 4 FEET APART.

3. SEDIMENT SHOULD BE REMOVED FROM BEHIND THE CHECK DAM ONCE THE

ACCUMULATED HEIGHT HAS REACHED 12 THE HEIGHT OF THE CHECK DAM.

4. CHECK DAMS CAN BE DIRECT SEEDED AT THE TIME OF INSTALLATION.

5. MINIMUM STAKING DEPTH FOR SAND, SILT, AND CLAY SHALL BE 18".

NOT TO SCALE

- TYPICAL SILT FENCE

DETAIL

NOT TO SCALE

- STRAW WATTLE STAKE

DETAIL

NOT TO SCALE

- TURBIDITY CURTAIN

DETAIL

NOT TO SCALE

- EROSION CONTROL BLANKET

DETAIL

NOT TO SCALE

- COMPOST FILTER SOCK FOR CHECK DAM

DETAIL

ATTACH FABRIC TO THE

POSTS WITH WIRE

STAPLES OR WOODEN

LATH AND NAILS

NOTES:

1. A SILT CURTAIN WILL BE INSTALLED AND MAINTAINED IN WORKING ORDER

DURING THE DREDGING OPERATION. CURTAIN SHALL BE FROM WATER

SURFACE TO WITHIN 1' OF THE LAKE BOTTOM AND SHALL BE ADEQUATELY

ANCHORED, CONTINUOUS, AND FABRICATED WITH GEOTEXTILE FILTER

FABRIC AND FLOATS DESCRIBED BELOW.

NOTES:

1. TRENCH SHALL BE MINIMUM OF 6" WIDE AND 6" DEEP TO BURY AND ANCHOR

GEOTEXTILE FABRIC. FOLD MATERIAL TO FIT TRENCH AND BACKFILL & COMPACT

TRENCH WITH EXCAVATED SOIL.

2. WOOD POSTS SHALL BE A MINIMUM SIZE OF 1 1/8" x 1 1/8" OAK OR HICKORY.

3. THE SOIL EROSION AND SEDIMENTATION CONTROL PERMIT OBTAINED BY THE

CONTRACTOR FROM THE LOCAL GOVERNING AGENCY SUPERCEDES THIS DETAIL.

NOT TO SCALE

- STABILIZED CONSTRUCTION ENTRANCE

DETAIL

NOT TO SCALE

- CREST ACCESS ROAD

DETAIL

NOT TO SCALE

- TOE ACCESS ROAD - THROUGH WETLAND

DETAIL

Z, A

C :\U se rs

\a le sc h3

D C

\A C

C D oc s\

C on su lta nt s\

Pr oj ec t F ile s\

W in ch es te r D am

\0 0_

\D es ig n\

Sh ee ts \E

C -2

D et ai ls

.d w g

GEI CONSULTANTS OF MICHIGAN, P.C.

401 S. WASHINGTON SQUARE

SUITE 103

LANSING, MI 48933

(517)803-4600

Consultants

S T.

G , M

I 4

) 2

-5

Attention:

0 1"

NO. DATE ISSUE/REVISION APP

0 7/22/2025 FINAL REPORT CG

If this scale bar does not measure 1" then drawing is not original scale.

SHEET NAME

A R

T O

C H

N O

Y, M

A N

A G

T, A

N D

B U

D G

P.E. No.:

Approved:

Checked:

Drawn:

Designed:

GEI Project:

T. Naperala C. Grundenmann

JRB/JPW

M. Carden 2407812 file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt file:///G:/Blocks/GEI%20General/D_GEI-Section-Mark-FULL_Help.txt

WET

ETW

WET

0+00

4+50

FLO

990 992

08-005-017-000

MICHIGAN DEPT OF

NATURAL RESOURCES

47TH AVE

BARRYTON, MI 49305

MARTINY LAKE

WSEL: 993.46

11/12/24

AUXILIARY SPILLWAY

NWI WETLAND BOUNDARY

BRIDGE

CROSSING

AUXILIARY

SPILLWAY

CREST

PROPERTY LINE

DELINEATED WETLAND BOUNDARY

WSEL: 986.81

11/12/24

EX GRADE BELOW 996.60

WET

WETWET

WET

WET WET

WET

WETWET

WETWETWET

WET

WETWET

WET

WET WET

WET

WET WET

WET WET WET

WET

1+00

2+00

3+00

4+00

HARDING RD

EX 4" HDPE

TILE DRAIN

FLO

EX GRADE BELOW 996.60

BOAT LAUNCH

21'-0"

STM

50'-0"

WEST BRANCH

CHIPPEWA RIVER

SOIL BORING AND WELL LOCATIONS

SCALE: 1" = 20'PLAN

B-100

Z, A

C :\U se rs

\a le sc h3

D C

\A C

C D oc s\

C on su lta nt s\

Pr oj ec t F ile s\

W in ch es te r D am

\0 0_

\D es ig n\

Sh ee ts \B

-1

O R

A N

D W

N P

.d w g

GEI CONSULTANTS OF MICHIGAN, P.C.

401 S. WASHINGTON SQUARE

SUITE 103

LANSING, MI 48933

(517)803-4600

Consultants

S T.

G , M

I 4

) 2

-5

Attention:

0 1"

NO. DATE ISSUE/REVISION APP

0 7/22/2025 FINAL REPORT CG

If this scale bar does not measure 1" then drawing is not original scale.

SHEET NAME

A R

T O

C H

N O

Y, M

A N

A G

T, A

N D

B U

D G

P.E. No.:

Approved:

Checked:

Drawn:

Designed:

GEI Project:

T. Naperala C. Grundenmann

JRB/JPW

M. Carden 2407812

SOIL BORING AND

WELL LOCATION

GRAVEL PARKING

A G-02

A' G-02

BORINGS TO BE COMPLETED AT LATER DATE.

WET

ETW

WET

0+00

4+50

FLO

990 992

08-005-017-000

MICHIGAN DEPT OF

NATURAL RESOURCES

47TH AVE

BARRYTON, MI 49305

MARTINY LAKE

WSEL: 993.46

11/12/24

AUXILIARY SPILLWAY

NWI WETLAND BOUNDARY

BRIDGE

CROSSING

AUXILIARY

SPILLWAY

CREST

PROPERTY LINE

DELINEATED WETLAND BOUNDARY

WSEL: 986.81

11/12/24

EX GRADE BELOW 996.60

WET

WETWET

WET

WET WET

WET

WETWET

WETWETWET

WET

WETWET

WET

WET WET

WET

WET WET

WET WET WET

WET

1+00

2+00

3+00

4+00

HARDING RD

EX 4" HDPE

TILE DRAIN

FLO

EX GRADE BELOW 996.60

BOAT LAUNCH

21'-0"

STM

50'-0"

WEST BRANCH

CHIPPEWA RIVER

CONTROL OF WATER

SCALE: 1" = 20'PLAN

CW-100

Z, A

C :\U se rs

\a le sc h3

D C

\A C

C D oc s\

C on su lta nt s\

Pr oj ec t F ile s\

W in ch es te r D am

\0 0_

\D es ig n\

Sh ee ts \C

W -1

O N

L O

F W

.d w g

GEI CONSULTANTS OF MICHIGAN, P.C.

401 S. WASHINGTON SQUARE

SUITE 103

LANSING, MI 48933

(517)803-4600

Consultants

S T.

G , M

I 4

) 2

-5

Attention:

0 1"

NO. DATE ISSUE/REVISION APP

0 7/22/2025 FINAL REPORT CG

If this scale bar does not measure 1" then drawing is not original scale.

SHEET NAME

A R

T O

C H

N O

Y, M

A N

A G

T, A

N D

B U

D G

P.E. No.:

Approved:

Checked:

Drawn:

Designed:

GEI Project:

T. Naperala C. Grundenmann

JRB/JPW

M. Carden 2407812

CONTROL OF

WATER

GRAVEL PARKING

A G-02

A' G-02

PLAN TO BE DEVELOPED.

WET

ETW

WET

0+00

4+50

FLO

990 992

08-005-017-000

MICHIGAN DEPT OF

NATURAL RESOURCES

47TH AVE

BARRYTON, MI 49305

MARTINY LAKE

WSEL: 993.46

11/12/24

AUXILIARY SPILLWAY

NWI WETLAND BOUNDARY

BRIDGE

CROSSING

AUXILIARY

SPILLWAY

CREST

PROPERTY LINE

DELINEATED WETLAND BOUNDARY

WSEL: 986.81

11/12/24

EX GRADE BELOW 996.60

WET

WETWET

WET

WET WET

WET

WETWET

WETWETWET

WET

WETWET

WET

WET WET

WET

WET WET

WET WET WET

WET

1+00

2+00

3+00

4+00

HARDING RD

EX 4" HDPE

TILE DRAIN

FLO

EX GRADE BELOW 996.60

BOAT LAUNCH

21'-0"

STM

50'-0"

WEST BRANCH

CHIPPEWA RIVER

DEMOLITION

SCALE: 1" = 20'PLAN

D-100

Z, A

C :\U se rs

\a le sc h3

D C

\A C

C D oc s\

C on su lta nt s\

Pr oj ec t F ile s\

W in ch es te r D am

\0 0_

\D es ig n\

Sh ee ts \D

-1

L D

O N

N .d w g

/3 0/

GEI CONSULTANTS OF MICHIGAN, P.C.

401 S. WASHINGTON SQUARE

SUITE 103

LANSING, MI 48933

(517)803-4600

Consultants

S T.

G , M

I 4

) 2

-5

Attention:

0 1"

NO. DATE ISSUE/REVISION APP

0 7/22/2025 FINAL REPORT CG

If this scale bar does not measure 1" then drawing is not original scale.

SHEET NAME

A R

T O

C H

N O

Y, M

A N

A G

T, A

N D

B U

D G

P.E. No.:

Approved:

Checked:

Drawn:

Designed:

GEI Project:

T. Naperala C. Grundenmann

JRB/JPW

M. Carden 2407812

OVERALL

DEMOLITION PLAN

WTR

0+00

4+50

FLO

REGRADE TO

3:1 SLOPE

TRAPEZOIDAL-SHAPED

AUXILIARY SPILLWAY CHUTE

990 992

WET

WETWET

WET

WET WET

WET

WETWET

WETWETWET

WET

WETWET

WET

WETWET

WET

WET WET

WET

WET WET

WET WET WET

WET

1+00

2+00

3+00

4+00

PROVIDE STOPLOG SEALS AND

LOCKING MECHANISM

B' C-00

B C-00

MDOT PLAIN RIPRAP

EX 4" HDPE

TILE DRAIN

24-INCH THICK MDOT PLAIN

RIPRAP 2H:1V SLOPE

FLO

24-INCH THICK

MDOT PLAIN RIPRAP

2H:1V SLOPE

RAISE CREST TO

EL 996.60

EX GRADE BELOW 996.60

21'-0"

STM

AUXILIARY SPILLWAY

INVERT EL 994.50

50'-0"

MDOT PLAIN RIPRAP

APPROXIMATE ALIGNMENT OF TOE DRAIN, 6" DIA

PERFORATED HDPE SDR 17 WITH MIN 6" MDOT 29A

DRAINAGE STONE SURROUNDING THE PIPE AND

12" MDOT 2NS FILTER SAND SURROUNDING THE

DRAINAGE STONE. AVERAGE PIPE INV EL 990,

BOTTOM OF EXCAVATION EL 995

CLEANOUT

2% SLOPE

CONCRETE OUTLET,

INV EL 987

SLOPE BREAK

AT EL 990

TEMPORARY COFFERDAM, BY

CONTRACTOR

12" DIA 29A FILTER STONE CORE

ALONG TOE ALIGNMENT,

DISCHARGING INTO RIPRAP

MDOT HEAVY RIPRAP

1+83

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 17001020

200YR

WTR

1'-6"

21'-0"

3' -6

2' -0

WTR

3' -0

10H:1V SLOPE

12" LAYER OF 3X6 BEDDING STONE,

UNDERLAIN BY 12" LAYER OF 29A

DRAINAGE GRAVEL, UNDERLAIN BY 12"

LAYER OF 2NS FILTER SAND.

3+43

0 10 20 3001020

PROP FILL

EX GRADE

PROP CREST EL

996.60

WTR

200YR

NORMAL POOL

WSEL 993.50

DESIGN STORM

WSEL 995.60

STRIP 6" TOPSOIL, PLACE MDOT 2NS

SAND, 6" TOPSOIL COVER, SEED

AND MULCH TO PROPOSED GRADES

PROPOSED SITE

PLAN

PROPOSED CONDITIONS

SCALE: 1" = 20'PLAN

AUXILIARY SPILLWAY PROPOSED CONDITIONS

SECTION

SCALE: 1" = 10'

C-00 C-100

Z, A

C :\U se rs

\a le sc h3

D C

\A C

C D oc s\

C on su lta nt s\

Pr oj ec t F ile s\

W in ch es te r D am

\0 0_

\D es ig n\

Sh ee ts \C

-1

P R

.d w g

/3 0/

GEI CONSULTANTS OF MICHIGAN, P.C.

401 S. WASHINGTON SQUARE

SUITE 103

LANSING, MI 48933

(517)803-4600

Consultants

S T.

G , M

I 4

) 2

-5

Attention:

0 1"

NO. DATE ISSUE/REVISION APP

0 7/22/2025 FINAL REPORT CG

If this scale bar does not measure 1" then drawing is not original scale.

SHEET NAME

DRAFT

A R

T O

C H

N O

Y, M

A N

A G

T, A

N D

B U

D G

P.E. No.:

Approved:

Checked:

Drawn:

Designed:

GEI Project:

T. Naperala C. Grundenmann

JRB/JPW

M. Carden 2407812

PROPOSED EMBANKMENT

SECTION

SCALE: 1" = 10'

C-00

EX GRADE

WSEL 986.81

11/12/24

DESIGN STORM

WSEL 995.60

NORMAL POOL

WSEL 993.50 PLAIN RIPRAP

AUX SPILLWAY

INVERT EL. 994.5

A C-00

A' C-00

PROP 12" DGA

SCOPE OF WORK ITEMS:

1. PRIMARY SPIILLWAY REPAIRS (BASE SCOPE)

A. NEW STOP LOG SEALS

B. PROVIDE STOP LOG LOCKING MECHANISM

C. CONCRETE REPAIRS

2. EMBANKMENT UPGRADES (ALTERNATE ADD 1)

A. UPSTREAM RIPRAP SLOPE LINING AND REGRADING

B. CREST RAISE AND GRADING

C. DOWNSTREAM TOE DRAIN AND GRANULAR FILTER

INSTALLATION, ASSUME DEWATERING WILL BE REQUIRED

D. DOWNSTREAM SLOPE REGRADING

E. DOWNSTREAM RIPRAP EROSION PROTECTION ON

DESIGNATED SLOPES AND TAILWATER AREAS

3. AUXILIARY SPILLWAY CONSTRUCTION (ALTERNATE ADD 2)

A. NEW CONCRETE CREST WITH STEM WALLS

B. HEAVY RIPRAP LINED CHANNEL, UNDERLAIN BY BEDDING

STONE, DRAINAGE STONE AND FILTER SAND.

CONTROL OF WATER:

1. PRIMARY SPILLWAY CONCRETE REPAIRS MAY BE

COMPLETED IN THE WET OR IN THE DRY, AT THE

CONTRACTOR'S DISCRESSION. REPAIRS MADE IN THE WET

WILL BE SUBJECT TO MATERIALS AND SEQUENCING

APPROPRIATE FOR UNDER-WATER CONCRETE WORK.

2. NO DRAWDOWN IS ANTICIPATED TO BE PERMITTED.

RESERVOIR MUST BE MAINTAINED AT EL ~993.5' FOR THE

DURATION OF CONSTRUCTION UNDER NORMAL FLOW

CONDITIONS.

3. COFFERDAMS ARE ANTICIPATED TO BE NEEDED FOR

AUXILARY SPILLWAY CONSTRUCTION. THE COFFERDAM

DESIGN IS DELEGATED TO THE CONTRACTOR AND WILL BE A

REQUIRED SUBMITTAL.

4. EXCAVATIONS FOR THE TOE DRAIN SYSTEM AND AUXILLARY

SPILLWAY WILL EXTEND BELOW THE NORMAL TAILWATER

ELEVATION AND THEREFORE, DEWATERING SHOULD BE

EXPECTED. DEWATERING SYSTEM DESIGN IS DELEGATED TO

THE CONTRACTOR AND WILL BE A REQUIRED SUBMITTAL.

GEOTEXTILE FABRIC, MIRI 1200 NONWOVEN

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File details come from the government source that posted it. Updated Aug 17, 2026.