Surry Mountain Dam
Key Takeaway
Surry Mountain Dam is classified as high hazard in New Hampshire. It was completed in 1941 and is 85 years old. Its primary use is flood risk reduction. 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 | 83 ft (taller than 98.8% in NH) |
| Dam Length | 1,800 ft |
| Dam Type | Rockfill |
| Max Storage | 44.0K acre-ft |
| Normal Storage | 1.3K acre-ft |
| Surface Area | 260 acres |
| Drainage Area | 100 sq mi |
| Max Discharge | 50,000 cfs |
| Year Completed | 1941 (85 years old) |
| NID ID | NH00007 |
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
USACE - New England District
Federal Government
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Low Hazard 11 ftFrequently Asked Questions
What is the hazard classification of Surry Mountain Dam?
Surry Mountain 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 Surry Mountain Dam?
Surry Mountain Dam is owned by USACE - New England District (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Surry Mountain Dam built?
Surry Mountain Dam was completed in 1941, making it 85 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 Surry Mountain Dam?
Surry Mountain Dam serves the following purposes: Flood Risk Reduction, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Surry Mountain Dam?
Surry Mountain Dam has a dam height of 83 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 Surry Mountain Dam last inspected?
Surry Mountain Dam was last inspected on June 5, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.