Sunset Lake Dam
Key Takeaway
Sunset Lake Dam is classified as high hazard in New Hampshire. It was completed in 1860 and is 166 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 | 17 ft (taller than 59.6% in NH) |
| Dam Length | 130 ft |
| Dam Type | Concrete |
| Max Storage | 1.9K acre-ft |
| Normal Storage | 1.4K acre-ft |
| Surface Area | 205 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 1,390 cfs |
| Year Completed | 1860 (166 years old) |
| Year Modified | 1961 |
| NID ID | NH00010 |
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
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High Hazard 19 ftFrequently Asked Questions
What is the hazard classification of Sunset Lake Dam?
Sunset Lake 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 Sunset Lake Dam?
Sunset Lake 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 Sunset Lake Dam built?
Sunset Lake Dam was completed in 1860, making it 166 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 Sunset Lake Dam?
Sunset Lake 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 Sunset Lake Dam?
Sunset Lake Dam has a dam height of 17 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 Sunset Lake Dam last inspected?
Sunset Lake Dam was last inspected on May 4, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.