Long Pond Dam
Key Takeaway
Long Pond Dam is classified as low hazard in New Hampshire. It was completed in 1910 and is 116 years old. Its primary use is recreation.
Physical Details
| Dam Height | 10 ft (taller than 16% in NH) |
| Dam Length | 260 ft |
| Dam Type | Concrete |
| Max Storage | 578 acre-ft |
| Normal Storage | 238 acre-ft |
| Surface Area | 120 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 536 cfs |
| Year Completed | 1910 (116 years old) |
| Year Modified | 1955 |
| NID ID | NH00271 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
TOWN OF LEMPSTER
Local Government
Nearby Dams
Sand Pond Dam
Cheshire, NH
Low Hazard 12 ftRichardson Brook Pond Dam
Sullivan, NH
Low Hazard 12 ftMillen Lake Dam
Sullivan, NH
Significant Hazard 23 ftAshuelot Pond Dam
Sullivan, NH
High Hazard 13 ftHigh View Wildlife Pond Dam
Sullivan, NH
Low Hazard 27 ftMay Pond Dam
Sullivan, NH
Significant Hazard 14 ftCold Brook Pond Dam
Sullivan, NH
Significant Hazard 19 ftVillage Pond Dam
Cheshire, NH
Low Hazard 12 ftFrequently Asked Questions
What is the hazard classification of Long Pond Dam?
Long Pond Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. 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 TOWN OF LEMPSTER (Local 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 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 Long Pond Dam?
Long Pond 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 Long Pond Dam?
Long Pond Dam has a dam height of 10 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 August 31, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.