Deferiet
Key Takeaway
Deferiet is classified as low hazard in New York. It was completed in 1899 and is 127 years old. Its primary use is hydroelectric.
Physical Details
| Dam Height | 18 ft (taller than 49.5% in NY) |
| Dam Length | 695 ft |
| Dam Type | Buttress |
| Max Storage | 405 acre-ft |
| Normal Storage | 405 acre-ft |
| Surface Area | 70 acres |
| Drainage Area | 1,817 sq mi |
| Max Discharge | 45,000 cfs |
| Year Completed | 1899 (127 years old) |
| NID ID | NY00297 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Erie Boulevard Hydropower, L.P.
Private
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Low Hazard 25 ftFrequently Asked Questions
What is the hazard classification of Deferiet?
Deferiet is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Deferiet?
Deferiet is owned by Erie Boulevard Hydropower, L.P. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Deferiet built?
Deferiet was completed in 1899, making it 127 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 Deferiet?
Deferiet serves the following purposes: Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Deferiet?
Deferiet has a dam height of 18 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 Deferiet last inspected?
Deferiet was last inspected on August 9, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.