Souhegan River Site 33 Dam
Key Takeaway
Souhegan River Site 33 Dam is classified as high hazard in New Hampshire. It was completed in 1971 and is 55 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 | 21 ft (taller than 74.5% in NH) |
| Dam Length | 510 ft |
| Dam Type | Earth |
| Max Storage | 900 acre-ft |
| Normal Storage | 24 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 2,100 cfs |
| Year Completed | 1971 (55 years old) |
| Year Modified | 1976 |
| NID ID | NH00265 |
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
NH DES WATER DIVISION
State Government
Nearby Dams
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High Hazard 15 ftFrog Pond Dam
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Significant Hazard 15 ftSouhegan Site 8 Cemetery Dike
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Low Hazard 16 ftNew Wilton Reservoir Dam
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High Hazard 24 ftSouhegan Site 8 Dam
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High Hazard 25 ftHillsborough Mill
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Significant Hazard 22 ftPeters Farm Pond Dam
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Significant Hazard 9 ftFrequently Asked Questions
What is the hazard classification of Souhegan River Site 33 Dam?
Souhegan River Site 33 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 Souhegan River Site 33 Dam?
Souhegan River Site 33 Dam is owned by NH DES WATER DIVISION (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Souhegan River Site 33 Dam built?
Souhegan River Site 33 Dam was completed in 1971, making it 55 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 Souhegan River Site 33 Dam?
Souhegan River Site 33 Dam serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Souhegan River Site 33 Dam?
Souhegan River Site 33 Dam has a dam height of 21 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 Souhegan River Site 33 Dam last inspected?
Souhegan River Site 33 Dam was last inspected on October 25, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.