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Johnston Dam
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Johnston Dam Share
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Overview Share
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Keosauqua, Iowa
Grade Stabilization
Privately owned
Built in 2005

Johnston Dam is an earth dam built on the Trib TO Des Moines River and is located in Keosauqua, Iowa. It was built in 2005 for the purpose of grade stabilization.

The dam is privately owned by Mike Johnston.

Location
Johnston Dam
Keosauqua, Iowa, U.S.
Dam type
Earth
Dam type
Grade stabilization
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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Mike Johnston
Owner
Private

Johnston Dam is privately owned by Mike Johnston.

Construction Share
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2005
Completed
USDA NRCS
Dam designer
Trib TO Des Moines River
River built on
Johnston Dam was built in 2005.
Metrics Share
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Summary
Dam length 220 feet
Dam height 29 feet
Max discharge 137 cubic feet per second
Max storage 29 acre feet
Normal storage 18 acre feet
Surface area 2 acres
Drainage area 0 square miles
220 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.

29 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.

137 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.

29 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.

18 acre feet
Normal storage

Normal storage is defined as the total storage space in a reservoir below the normal retention level, including dead and inactive storage and excluding any flood control or surcharge storage. For normally dry flood control dams, the normal storage will be a zero value.

2 acres
Surface area

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

0 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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Low
Downstream potential hazard

Dams assigned the low hazard potential classification are those where failure or misoperation results in no probable loss of human life and low economic and/or environ-mental losses. Losses are principally limited to the owner’s property.

Not required
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.

About Share
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Distance to nearest town (miles) 3
Latitude 40
Longitude -92
NID ID (National ID) IA04059

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