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Rapidan Dam
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Mankato, Minnesota
Hydroelectric
Privately owned
Built in 1910

Rapidan Dam is a buttress dam built on the Blue Earth River and is located in Mankato, Minnesota. It was built in 1910 for the purpose of hydroelectric.

The dam is privately owned by Rapidan Redevelopment LTD.

Location
Rapidan Dam
Mankato, Minnesota, U.S.
Dam type
Buttress
Dam type
Hydroelectric
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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Rapidan Redevelopment LTD
Owner
Private

Rapidan Dam is privately owned by Rapidan Redevelopment LTD.

Construction Share
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1910
Completed
Indeco
Dam designer
Blue Earth River
River built on
Rapidan Dam was built in 1910.
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Summary
Dam length 414 feet
Dam height 73 feet
Hydraulic height 62 feet
Max discharge 51,700 cubic feet per second
Max storage 8,320 acre feet
Normal storage 8,320 acre feet
Surface area 415 acres
Drainage area 2,430 square miles
414 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.

73 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.

62 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.

51,700 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.

8,320 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.

8,320 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.

415 acres
Surface area

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

2,430 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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Significant
Downstream potential hazard

Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be located in areas with population and significant infrastructure.

Has emergency action plan
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.

5/22/2018
Most recent inspection date

Inspections are every 3 years.

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Distance to nearest town (miles) 9
Latitude 44
Longitude -94
NID ID (National ID) MN00512

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