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Hapgood Pond Dam
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Hapgood Pond Dam Share
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Overview Share
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Londonderry, Vermont
Water Supply
Federal ownership
Built in 1980

Hapgood Pond Dam is built on the Flood Brook River and is located in Londonderry, Vermont. It was built in 1980 and modified in 2000S for the purpose of water supply.

The dam is under federal ownership and is owned by the USDA FS.

Location
Hapgood Pond Dam
Londonderry, Vermont, U.S.
Dam type
Other
Dam type
Water supply
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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USDA FS
Owner
Federal

Hapgood Pond Dam is under federal ownership and is owned by the USDA FS.

Construction Share
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1980
Completed
2000S
Modified
Flood Brook River
River built on
Hapgood Pond Dam was built in 1980 and modified in 2000S.
Metrics Share
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Summary
Dam length 128 feet
Dam height 20 feet
Hydraulic height 14 feet
Max discharge 318 cubic feet per second
Max storage 86 acre feet
Normal storage 43 acre feet
Surface area 8 acres
Drainage area 4 square miles
128 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.

20 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.

14 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.

318 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.

86 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.

43 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.

8 acres
Surface area

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

4 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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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.

5/15/2014
Most recent inspection date

Inspections are every 10 years.

About Share
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Distance to nearest town (miles) 5
Latitude 43
Longitude -72
NID ID (National ID) VT00354

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