Camp Siwanoy Dam Reservoir Report

Last Updated: December 5, 2025

Camp Siwanoy Dam, located in Dutchess County, New York, serves as a vital structure for recreation and water resource management.


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Summary

Built in 1926, this earth dam stands at a height of 20 feet and spans 260 feet in length, with a storage capacity of 52 acre-feet. The dam is situated on Deuel Hollow Brook, a tributary that covers a drainage area of 4.68 square miles, providing a surface area of 4 acres for recreational activities.

Managed by a private owner, Camp Siwanoy Dam is regulated by the New York State Department of Environmental Conservation (NYS DEC), ensuring its compliance with state inspection and enforcement protocols. Despite being rated with a low hazard potential and a lack of current condition assessment, the dam's Emergency Action Plan (EAP) was last revised in 2010, indicating a need for updated risk management measures. While the dam's primary purpose remains for recreation, its role in water resource management and the conservation of Deuel Hollow Brook underscores its importance in balancing environmental stewardship and public enjoyment.

Year Completed

1926

Dam Length

260

Dam Height

20

River Or Stream

DEUEL HOLLOW BROOK

Primary Dam Type

Earth

Surface Area

4

Drainage Area

4.68

Nid Storage

52

Hazard Potential

Low

Nid Height

20
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
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 in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.