Granite Lake Dam
Key Takeaway
Granite Lake Dam is classified as high hazard in New Hampshire. It was completed in 1814 and is 212 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 | 11 ft (taller than 23.8% in NH) |
| Dam Length | 90 ft |
| Dam Type | Earth |
| Max Storage | 990 acre-ft |
| Normal Storage | 765 acre-ft |
| Surface Area | 211 acres |
| Drainage Area | 4 sq mi |
| Year Completed | 1814 (212 years old) |
| NID ID | NH00336 |
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
GRANITE LAKE VILLAGE DISTRICT
Local Government
Nearby Dams
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High Hazard 17 ftSilver Lake Dam
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High Hazard 30 ftNubanusit Lake Dam
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Low Hazard 13 ftCold Spring Pond Dam
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Low Hazard 9 ftFrequently Asked Questions
What is the hazard classification of Granite Lake Dam?
Granite 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 Granite Lake Dam?
Granite Lake Dam is owned by GRANITE LAKE VILLAGE DISTRICT (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Granite Lake Dam built?
Granite Lake Dam was completed in 1814, making it 212 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 Granite Lake Dam?
Granite 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 Granite Lake Dam?
Granite Lake Dam has a dam height of 11 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 Granite Lake Dam last inspected?
Granite Lake Dam was last inspected on June 10, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.