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Willough Dam
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Overview Share
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Poplar, Montana
Privately owned
Built in 1952

Willough Dam is an earth dam built on the Tr-Redwater River and is located in Poplar, Montana. It was built in 1952 for the purpose of irrigation.

The dam is privately owned by Daton A. Willoughby.

Willough Dam
Poplar, Montana, U.S.
Dam type
Dam type
Foundation type
Core type
Ownership Share
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Daton A. Willoughby

Willough Dam is privately owned by Daton A. Willoughby.

Construction Share
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Dam designer
Tr-Redwater River
River built on
Willough Dam was built in 1952.
Metrics Share
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Dam length 1,000 feet
Dam height 24 feet
Hydraulic height 24 feet
Max discharge 200 cubic feet per second
Max storage 283 acre feet
Normal storage 164 acre feet
Drainage area 2 square miles
1,000 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.

24 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.

24 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.

200 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.

283 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.

164 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 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.

Safety Share
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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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Latitude 47
Longitude -105
NID ID (National ID) MT02499

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