Great Hill Reservior Dam
Key Takeaway
Great Hill Reservior Dam is classified as high hazard in Connecticut. It was completed in 1909 and is 117 years old. Its primary use is recreation. 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 | 41 ft (taller than 94.2% in CT) |
| Dam Length | 165 ft |
| Dam Type | Concrete |
| Max Storage | 378 acre-ft |
| Normal Storage | 360 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 810 cfs |
| Year Completed | 1909 (117 years old) |
| NID ID | CT00087 |
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
Town of Seymour
Local Government
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Significant Hazard 13 ftFrequently Asked Questions
What is the hazard classification of Great Hill Reservior Dam?
Great Hill Reservior Dam 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 Great Hill Reservior Dam?
Great Hill Reservior Dam is owned by Town of Seymour (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Great Hill Reservior Dam built?
Great Hill Reservior Dam was completed in 1909, making it 117 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 Great Hill Reservior Dam?
Great Hill Reservior Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Great Hill Reservior Dam?
Great Hill Reservior Dam has a dam height of 41 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 Great Hill Reservior Dam last inspected?
Great Hill Reservior Dam was last inspected on August 15, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.