Crystal Lake Dam
Key Takeaway
Crystal Lake Dam is classified as significant hazard in New Hampshire. It was completed in 1910 and is 116 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 22 ft (taller than 76.5% in NH) |
| Dam Length | 170 ft |
| Dam Type | Earth |
| Max Storage | 4.6K acre-ft |
| Normal Storage | 2.1K acre-ft |
| Surface Area | 378 acres |
| Drainage Area | 13 sq mi |
| Max Discharge | 2,404 cfs |
| Year Completed | 1910 (116 years old) |
| Year Modified | 1984 |
| NID ID | NH00269 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
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
George Pond Dam
Grafton, NH
High Hazard 11 ftGrafton Pond Dam
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Low Hazard 21 ftSmith Pond Dam
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High Hazard 12 ftBaltic Mills Dam
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Low Hazard 21 ftGoose Pond Dam
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High Hazard 31 ftCanaan Street Lake Dam
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Low Hazard 14 ftHarris Brook Reservoir Dam
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Significant Hazard 22 ftMontcalm Golf Club Dam
Grafton, NH
Low Hazard 27 ftFrequently Asked Questions
What is the hazard classification of Crystal Lake Dam?
Crystal Lake Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Crystal Lake Dam?
Crystal 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 Crystal Lake Dam built?
Crystal Lake Dam was completed in 1910, making it 116 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 Crystal Lake Dam?
Crystal 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 Crystal Lake Dam?
Crystal Lake Dam has a dam height of 22 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 Crystal Lake Dam last inspected?
Crystal Lake Dam was last inspected on October 21, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.