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Coffeen GMF Gypsum Stack Dam
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Coffeen GMF Gypsum Stack Dam Share
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Coffeen, Illinois
Debris Control
Public utility owned

Coffeen GMF Gypsum Stack Dam is an earth dam built on the Mcdavid Branch East Fork Shoal River and is located in Coffeen, Illinois. It was built for the purpose of debris control.

The dam is owned by the public utility, Dynegy Midwest Generation, Inc. It is also known as Ameren Coffeen GMF Gypsum Stack Dam.

Location
Coffeen GMF Gypsum Stack Dam
Coffeen, Illinois, U.S.
Dam type
Earth
Dam type
Debris control
Purpose
Unknown
Foundation type
Unknown
Core type
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Dynegy Midwest Generation, Inc.
Owner
Public utility

Coffeen GMF Gypsum Stack Dam is owned by the public utility, Dynegy Midwest Generation, Inc..

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Summary
Dam length 5,100 feet
Dam height 108 feet
Max discharge 1,100 cubic feet per second
Max storage 2,355 acre feet
Surface area 38 acres
Drainage area 38 square miles
5,100 feet
Dam length

Length of the dam is defined as the length along the top of the dam. This also includes the spillway, powerplant, navigation lock, fish pass, etc., where these form part of the length of the dam. If detached from the dam, these structures should not be included.

108 feet
Dam height

Height of the dam is defined as the vertical distance between the lowest point on the crest of the dam and the lowest point in the original streambed.

1,100 cubic feet per second
Max discharge

Number of cubic feet per second the spillway is capable of discharging when the reservoir is at its maximum designed water surface elevation.

2,355 acre feet
Max storage

Maximum storage is defined as the total storage space in a reservoir below the maximum attainable water surface elevation, including any surcharge storage.

38 acres
Surface area

Surface area, in acres, of the impoundment at its normal retention level.

38 square miles
Drainage area

Drainage area of the dam, in square miles, which is defined as the area that drains to a particular point (in this case, the dam) on a river or stream.

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High
Downstream potential hazard

Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.

Has emergency action plan
Emergency action plan

An emergency action plan is defined as a plan of action to be taken to reduce the potential for property damage and loss of life in an area affected by a dam failure or large flood.

9/27/2016
Most recent inspection date

Inspections are every 1 ear.

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Also known as Ameren Coffeen GMF Gypsum Stack Dam
Distance to nearest town (miles) 1
Latitude 39
Longitude -89
NID ID (National ID) IL50579

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