Tomkins Cove Dam Reservoir Report

Last Updated: December 21, 2025

Tomkins Cove Dam, located in Tomkins Cove, New York, stands as a testament to early 20th-century engineering ingenuity with its masonry construction completed in 1915.


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Summary

The dam serves a primary purpose of irrigation, holding a storage capacity of 16 acre-feet and covering a surface area of 6 acres. Situated on the TR-Hudson River, the dam is regulated by the New York State Department of Environmental Conservation (NYS DEC) and undergoes regular inspections, with the last assessment conducted in June 2019.

Despite its historical significance, Tomkins Cove Dam faces challenges in terms of its condition assessment, marked as poor, and its hazard potential, deemed significant. The dam's spillway type is classified as uncontrolled, with a spillway width of 8 feet. The risk assessment indicates a moderate level of risk, with the dam's risk management measures and emergency action plan status remaining unspecified. While the dam's structural integrity may raise concerns, its presence as a vital water resource infrastructure in Rockland County underscores the importance of ongoing monitoring and maintenance efforts to ensure the safety of the surrounding community and the reliability of its irrigation functions.

Year Completed

1915

Dam Length

325

Dam Height

8

River Or Stream

TR-HUDSON RIVER

Primary Dam Type

Masonry

Surface Area

6

Drainage Area

5

Nid Storage

16

Hazard Potential

Significant

Nid Height

8
       
Seasonal Comparison

Weather Forecast

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.