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Chiselhurst Dam
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Chiselhurst Dam Share
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Chappaqua, New York
Privately owned
Built in 1921

Chiselhurst Dam is a concrete dam built on the Tr-Saw Mill River and is located in Chappaqua, New York. It was built in 1921 for the purpose of recreation.

The dam is privately owned by Stephen Mazias and Theresa Lant. It is also known as Tercia Pond.

Chiselhurst Dam
Chappaqua, New York, U.S.
Dam type
Dam type
Foundation type
Core type
Ownership Share
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Stephen Mazias and Theresa Lant

Chiselhurst Dam is privately owned by Stephen Mazias and Theresa Lant.

Construction Share
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Tr-Saw Mill River
River built on
Chiselhurst Dam was built in 1921.
Metrics Share
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Dam length 30 feet
Dam height 20 feet
Max storage 44 acre feet
Normal storage 40 acre feet
Surface area 6 acres
Drainage area 1 square miles
30 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.

44 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.

40 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.

6 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 Tercia Pond
Latitude 41
Longitude -73
NID ID (National ID) NY13582

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