Long Pond Dam
Long Pond Dam is a concrete dam located in Sullivan County, New Hampshire, built in 1910. It carries a Low hazard potential classification and has a fair condition assessment.
About Long Pond Dam
The primary purpose of Long Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Town Of Lempster (local government). It impounds the Tr Ashuelot River near Lempster.
The dam stands 10 feet tall and stretches 260 feet across, creates a reservoir covering 120 acres, has a maximum storage capacity of 578 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1910, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 08/31/2021.
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Location
| State | New Hampshire |
| County | Sullivan |
| Nearest City | Lempster |
| River/Stream | Tr Ashuelot River |
| Coordinates | 43.18386, -72.14928 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 260 ft |
| Year Completed | 1910 (116 years old) |
Storage & Hydraulics
| NID Storage | 578 acre-ft |
| Max Storage | 578 acre-ft |
| Normal Storage | 238 acre-ft |
| Surface Area | 120 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 536 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | TOWN OF LEMPSTER |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 08/31/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00271 |
| Federal ID | NH00271 |
| More Info | State Dam Safety Program |