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Long Lake Dam
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Long Lake Dam Share
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Hoffman, Minnesota
State owned
Built in 1938

Long Lake Dam is built on the Chippewa River and is located in Hoffman, Minnesota. It was built in 1938 and modified in 1974 .

The state-owned dam is owned by the MNDNR.

Location
Long Lake Dam
Hoffman, Minnesota, U.S.
Dam type
Other
Dam type
Other
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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MNDNR
Owner
State

The state-owned dam is owned by the MNDNR.

Construction Share
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1938
Completed
1974
Modified
Wpa-C
Dam designer
Chippewa River
River built on
Long Lake Dam was built in 1938 and modified in 1974.
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Summary
Dam length 35 feet
Dam height 6 feet
Structural height 8 feet
Hydraulic height 2 feet
Max discharge 1,470 cubic feet per second
Max storage 2,255 acre feet
Normal storage 1,640 acre feet
Surface area 218 acres
Drainage area 143 square miles
35 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.

6 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.

8 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.

2 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.

1,470 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.

2,255 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.

1,640 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.

218 acres
Surface area

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

143 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.

6/22/2009
Most recent inspection date

Inspections are every 8 years.

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Distance to nearest town (miles) 18
Latitude 45
Longitude -95
NID ID (National ID) MN00171

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