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Percy Dam
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Percy Dam Share
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Overview Share
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, South Dakota
Water Supply
Privately owned
Built in 1956

Percy Dam is an earth dam built on the Tr-Cheyenne River and is located in , South Dakota. It was built in 1956 for the purpose of water supply.

The dam is privately owned by Mary Percy.

Location
Percy Dam
, South Dakota, U.S.
Dam type
Earth
Dam type
Water supply
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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Mary Percy
Owner
Private

Percy Dam is privately owned by Mary Percy.

Construction Share
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1956
Completed
USDA NRCS
Dam designer
Tr-Cheyenne River
River built on
Percy Dam was built in 1956.
Metrics Share
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Summary
Dam length 700 feet
Dam height 21 feet
Structural height 21 feet
Hydraulic height 21 feet
Max discharge 1,240 cubic feet per second
Max storage 80 acre feet
Normal storage 55 acre feet
700 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.

21 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.

21 feet
Structural height

Structural height of the dam is defined as the vertical distance from the lowest point of the excavated foundation to the top of the dam. Top of dam refers to the parapet wall and not the crest.

21 feet
Hydraulic height

Hydraulic height of the dam is defined as the vertical difference between the maximum design water level and the lowest point in the original streambed.

1,240 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.

80 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.

55 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.

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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.

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Latitude 43
Longitude -102
NID ID (National ID) SD01924

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