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Lefferts Grist Mill Dam
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Lefferts Grist Mill Dam Share
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Overview Share
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, New York
Recreation
Privately owned
Built in 1800

Lefferts Grist Mill Dam is an earth dam built on the Tr-Huntington Harbor River and is located in , New York. It was built in 1800 for the purpose of recreation.

The dam is privately owned by Nature Conservancy Inc. It is also known as Lefferts Grist Mill Pond.

Location
Lefferts Grist Mill Dam
, New York, U.S.
Dam type
Earth
Dam type
Recreation
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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Nature Conservancy Inc
Owner
Private

Lefferts Grist Mill Dam is privately owned by Nature Conservancy Inc.

Construction Share
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1800
Completed
Tr-Huntington Harbor River
River built on
Lefferts Grist Mill Dam was built in 1800.
Metrics Share
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Summary
Dam length 730 feet
Dam height 8 feet
Max discharge 360 cubic feet per second
Max storage 54 acre feet
Normal storage 27 acre feet
Surface area 15 acres
730 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.

8 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.

360 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.

54 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.

27 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.

15 acres
Surface area

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

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.

5/5/2009
Most recent inspection date

About Share
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Also known as Lefferts Grist Mill Pond
Latitude 40
Longitude -73
NID ID (National ID) NY01502

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