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Duffy Lake Dam
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Duffy Lake Dam Share
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Overview Share
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Florence, Montana
Recreation
Federal ownership
Built in 1917

Duffy Lake Dam is an earth dam built on the Tr-North Fork Sweeney Creek River and is located in Florence, Montana. It was built in 1917 for the purpose of recreation.

The dam is under federal ownership and is owned by the U.S. D.A. F.S.

Location
Duffy Lake Dam
Florence, Montana, U.S.
Dam type
Earth
Dam type
Recreation
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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U.S. D.A. F.S.
Owner
Federal

Duffy Lake Dam is under federal ownership and is owned by the U.S. D.A. F.S..

Construction Share
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1917
Completed
Tr-North Fork Sweeney Creek River
River built on
Duffy Lake Dam was built in 1917.
Metrics Share
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Summary
Dam length 330 feet
Dam height 9 feet
Hydraulic height 9 feet
Max storage 67 acre feet
Normal storage 20 acre feet
330 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.

9 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.

9 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.

67 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.

20 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.

Safety Share
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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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Distance to nearest town (miles) 12
Latitude 46
Longitude -114
NID ID (National ID) MT00891

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