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Mansfield Hollow Dam - Dike A.
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Willimantic, Connecticut
Flood Control
Federal ownership
Built in 1952

Mansfield Hollow Dam - Dike A. is built on the Nachaug River and is located in Willimantic, Connecticut. It was built in 1952 for the purpose of flood control.

The dam is under federal ownership and is owned by the Cenae. It is also known as Mansfield Hollow Lake.

Location
Mansfield Hollow Dam - Dike A.
Willimantic, Connecticut, U.S.
Dam type
Other
Dam type
Flood control
Purpose
Unknown
Foundation type
Earth
Core type
Ownership Share
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Cenae
Owner
Federal

Mansfield Hollow Dam - Dike A. is under federal ownership and is owned by the Cenae.

Construction Share
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1952
Completed
Nachaug River
River built on
Mansfield Hollow Dam - Dike A. was built in 1952.
Metrics Share
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Summary
Dam length 14,050 feet
Dam height 78 feet
Structural height 78 feet
Hydraulic height 74 feet
Max discharge 106,500 cubic feet per second
Max storage 76,000 acre feet
Normal storage 2,800 acre feet
Surface area 450 acres
Drainage area 159 square miles
14,050 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.

78 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.

78 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.

74 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.

106,500 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.

76,000 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.

2,800 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.

450 acres
Surface area

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

159 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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High
Downstream potential hazard

Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.

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.

6/2/2015
Most recent inspection date

Inspections are every 5 years.

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Also known as Mansfield Hollow Lake
Distance to nearest town (miles) 4
Latitude 41
Longitude -72
NID ID (National ID) CT00503

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