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Ayers Island Dam
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Ayers Island Dam Share Share

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Bristol, New Hampshire
Hydroelectric
Public utility owned
Built in 1924

Ayers Island Dam is built on the Pemigewasset River and is located in Bristol, New Hampshire. It was built in 1924 and modified in 1929 for the purpose of hydroelectric.

The dam is owned by the public utility, Public Service Company of New Hampshire.

Location
Ayers Island Dam
Bristol, New Hampshire, U.S.
Dam type
Other
Dam type
Hydroelectric
Purpose
Unknown
Foundation type
Unknown
Core type
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Ownership Share Share
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Public Service Company of New Hampshire
Owner
Public utility

Ayers Island Dam is owned by the public utility, Public Service Company of New Hampshire.

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Construction Share Share
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1924
Completed
1929
Modified
Ambursen Dam Company
Dam designer
Pemigewasset River
River built on
Ayers Island Dam was built in 1924 and modified in 1929.
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Metrics Share Share
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Summary
Dam length 699 feet
Dam height 80 feet
Max discharge 72,000 cubic feet per second
Max storage 10,000 acre feet
Normal storage 10,000 acre feet
Surface area 800 acres
Drainage area 746 square miles
699 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.

80 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.

72,000 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.

10,000 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.

10,000 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.

800 acres
Surface area

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

746 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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Safety Share Share
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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.

5/10/2017
Most recent inspection date

Inspections are every 1 ear.

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About Share Share
Latitude 43
Longitude -71
NID ID (National ID) NH00160
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