Cannonsville Reservoir Report

Last Updated: December 6, 2025

Cannonsville is a key water resource and climate infrastructure located in Deposit, Delaware County, New York.


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Summary

This hydroelectric facility, completed in 1964, plays a crucial role in managing the West Branch Delaware River and providing water supply for the region. With a dam height of 175 feet and a storage capacity of 434,300 acre-feet, Cannonsville covers a surface area of 4,800 acres and serves as a vital component of the local water management system.

Managed by the Federal Energy Regulatory Commission, Cannonsville is regulated by the New York State Department of Environmental Conservation to ensure its safe operation and compliance with state regulations. The dam boasts a spillway width of 800 feet and a maximum discharge capacity of 200,000 cubic feet per second, highlighting its importance in flood control and water flow management in the area. Despite being classified as having a high hazard potential, the risk assessment for the facility is moderate, indicating robust risk management measures in place to mitigate potential hazards.

Overall, Cannonsville stands as a significant hydroelectric and water supply infrastructure in New York, playing a crucial role in water resource management and climate resilience efforts in the region. Its strategic location on the West Branch Delaware River, coupled with its substantial storage capacity and flood control capabilities, underscores its importance in ensuring water security and environmental sustainability for local communities.

Year Completed

1964

Dam Length

2800

Dam Height

175

River Or Stream

West Branch Delaware River

Surface Area

4800

Drainage Area

456

Nid Storage

434300

Hazard Potential

High

Nid Height

175
       
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.