Long Pond Dam
Key Takeaway
Long Pond Dam is classified as significant hazard in New Hampshire. It was completed in 1933 and is 93 years old. Its primary use is fish and wildlife pond. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 12 ft (taller than 28.2% in NH) |
| Dam Length | 415 ft |
| Dam Type | Earth |
| Max Storage | 250 acre-ft |
| Normal Storage | 250 acre-ft |
| Surface Area | 50 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,650 cfs |
| Year Completed | 1933 (93 years old) |
| NID ID | NH00266 |
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
USDA FS
Federal Government
Nearby Dams
Oliverian Dam
Grafton, NH
High Hazard 52 ftUpper Mountain Lake Dam
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Low Hazard 31 ftLower Mountain Lake Dam
Grafton, NH
Significant Hazard 33 ftBeaver Pond
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Low Hazard 14 ftChandler Pond Dam
Grafton, NH
Significant Hazard 14 ftWeeks Crossing Pond Dam
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Significant Hazard 14 ftLake Tarleton Dam
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Low Hazard 8 ftArmington Lake Dam
Grafton, NH
Significant Hazard 9 ftFrequently Asked Questions
What is the hazard classification of Long Pond Dam?
Long Pond 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 Long Pond Dam?
Long Pond Dam is owned by USDA FS (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Long Pond Dam built?
Long Pond Dam was completed in 1933, making it 93 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 Long Pond Dam?
Long Pond Dam serves the following purposes: Fish And Wildlife Pond, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Long Pond Dam?
Long Pond Dam has a dam height of 12 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 Long Pond Dam last inspected?
Long Pond Dam was last inspected on July 18, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.