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Monhagen Lake Dam
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Monhagen Lake Dam Share
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Overview Share
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Middletown, New York
Water Supply
Local government owned
Built in 1867

Monhagen Lake Dam is built on the Monhagen Brook River and is located in Middletown, New York. It was built in 1867 for the purpose of water supply.

The dam is owned by the local government. It is also known as Reservoir #1 Dam.

Monhagen Lake Dam
Middletown, New York, U.S.
Dam type
Dam type
Water supply
Foundation type
Core type
Ownership Share
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City of Middletown
Local government

Monhagen Lake Dam is owned by the local government.

Construction Share
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Monhagen Brook River
River built on
Monhagen Lake Dam was built in 1867.
Metrics Share
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Dam length 300 feet
Dam height 12 feet
Max discharge 42 cubic feet per second
Max storage 858 acre feet
Normal storage 635 acre feet
Surface area 65 acres
Drainage area 1 square miles
300 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.

12 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.

42 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.

858 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.

635 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.

65 acres
Surface area

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

1 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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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.

Most recent inspection date

Inspections are every 4 years.

About Share
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Also known as Reservoir #1 Dam
Latitude 41
Longitude -74
NID ID (National ID) NY16220

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