Minnewawa
Key Takeaway
Minnewawa is classified as high hazard in New Hampshire. It was completed in 1923 and is 103 years old. Its primary use is hydroelectric. 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 | 63 ft (taller than 96.8% in NH) |
| Dam Length | 265 ft |
| Dam Type | Concrete |
| Max Storage | 155 acre-ft |
| Normal Storage | 155 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 23 sq mi |
| Max Discharge | 1,700 cfs |
| Year Completed | 1923 (103 years old) |
| NID ID | NH00104 |
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
Marlborough Hydro Associates
Private
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High Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Minnewawa?
Minnewawa 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 Minnewawa?
Minnewawa is owned by Marlborough Hydro Associates (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Minnewawa built?
Minnewawa was completed in 1923, making it 103 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 Minnewawa?
Minnewawa 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 Minnewawa?
Minnewawa has a dam height of 63 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 Minnewawa last inspected?
Minnewawa was last inspected on June 14, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.