Granby
Key Takeaway
Granby is classified as significant hazard in New York. It was completed in 1926 and is 100 years old. Its primary use is hydroelectric. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 15 ft (taller than 37.1% in NY) |
| Dam Length | 509 ft |
| Dam Type | Masonry |
| Max Storage | 620 acre-ft |
| Normal Storage | 620 acre-ft |
| Surface Area | 33 acres |
| Drainage Area | 5,018 sq mi |
| Max Discharge | 37,500 cfs |
| Year Completed | 1926 (100 years old) |
| NID ID | NY00406 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
New York State Canal Corporation
State Government
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Significant Hazard 11 ftFrequently Asked Questions
What is the hazard classification of Granby?
Granby is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Granby?
Granby is owned by New York State Canal Corporation (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Granby built?
Granby was completed in 1926, making it 100 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 Granby?
Granby serves the following purposes: Hydroelectric, Navigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Granby?
Granby has a dam height of 15 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 Granby last inspected?
Granby was last inspected on June 28, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.