Pump House Dam Reservoir Report

Last Updated: December 5, 2025

Pump House Dam, located in Watertown, New York, stands as a testament to engineering ingenuity since its completion in 1895.


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Summary

This concrete dam on the Black River serves various purposes beyond flood control, with a storage capacity of 56 acre-feet and a maximum discharge of 40,000 cubic feet per second. The dam also boasts a controlled spillway with a width of 650 feet, showcasing its robust design and hydraulic capabilities.

Managed by the local government and regulated by the New York State Department of Environmental Conservation, Pump House Dam has a low hazard potential and is classified as "Not Rated" in terms of condition assessment. Despite its age, the dam's risk assessment remains at a very high level, indicating the need for continued monitoring and potential risk management measures. With its historical significance and vital role in water resource management, Pump House Dam serves as a focal point for water resource and climate enthusiasts interested in the intersection of infrastructure, sustainability, and environmental stewardship in the region.

As part of the Buffalo District of the U.S. Army Corps of Engineers, Pump House Dam's contribution to the local community and ecosystem cannot be understated. With its strategic location and impact on the surrounding area, the dam stands as a crucial structure for water supply, recreational activities, and environmental protection. As climate change continues to pose challenges to water resources, Pump House Dam represents a key asset in ensuring water security and resilience in the face of evolving environmental conditions.

Year Completed

1895

Dam Length

750

Dam Height

16

River Or Stream

BLACK RIVER

Primary Dam Type

Concrete

Surface Area

7

Drainage Area

1874

Nid Storage

56

Hazard Potential

Low

Nid Height

16
       
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.