Cannonsville
Key Takeaway
Cannonsville is classified as high hazard in New York. It was completed in 1964 and is 62 years old. Its primary use is hydroelectric. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 175 ft (taller than 99.6% in NY) |
| Dam Length | 2,800 ft |
| Max Storage | 434.3K acre-ft |
| Normal Storage | 300.0K acre-ft |
| Surface Area | 4,800 acres |
| Drainage Area | 456 sq mi |
| Max Discharge | 200,000 cfs |
| Year Completed | 1964 (62 years old) |
| NID ID | NY00542 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
City of New York
Local Government
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Low Hazard 7 ftFrequently Asked Questions
What is the hazard classification of Cannonsville?
Cannonsville is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Cannonsville?
Cannonsville is owned by City of New York (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Cannonsville built?
Cannonsville was completed in 1964, making it 62 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Cannonsville?
Cannonsville serves the following purposes: Hydroelectric, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Cannonsville?
Cannonsville has a dam height of 175 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Cannonsville last inspected?
Cannonsville was last inspected on May 4, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.