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Pigors Dam
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Ferney, South Dakota
Recreation
State owned
Built in 1937

Pigors Dam is an earth dam built on the Tr-James River and is located in Ferney, South Dakota. It was built in 1937 and modified in 2000 for the purpose of recreation.

The state-owned dam is owned by the GF&P.

Location
Pigors Dam
Ferney, South Dakota, U.S.
Dam type
Earth
Dam type
Recreation
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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GF&P
Owner
State

The state-owned dam is owned by the GF&P.

Construction Share
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1937
Completed
2000
Modified
Wpa
Dam designer
Tr-James River
River built on
Pigors Dam was built in 1937 and modified in 2000.
Metrics Share
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Summary
Dam length 900 feet
Dam height 20 feet
Structural height 20 feet
Hydraulic height 20 feet
Max discharge 5,700 cubic feet per second
Max storage 950 acre feet
Normal storage 350 acre feet
Surface area 58 acres
Drainage area 9 square miles
900 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.

20 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.

20 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.

20 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.

5,700 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.

950 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.

350 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.

58 acres
Surface area

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

9 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.

5/30/2017
Most recent inspection date

Inspections are every 3 years.

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Distance to nearest town (miles) 6
Latitude 45
Longitude -97
NID ID (National ID) SD02138

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