May Pond Dam
May Pond Dam is an earth dam located in Sullivan County, New Hampshire, built in 1830. It carries a Significant hazard potential classification and has a fair condition assessment.
About May Pond Dam
The primary purpose of May Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Nh Dncr (state). It impounds the Ashuelot River near Washington.
The dam stands 14 feet tall and stretches 215 feet across, creates a reservoir covering 158 acres, has a maximum storage capacity of 950 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1830, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in 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. An emergency action plan is in place for this dam. The most recent inspection on record was 04/30/2020.
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Location
| State | New Hampshire |
| County | Sullivan |
| Nearest City | Washington |
| River/Stream | Ashuelot River |
| Coordinates | 43.22626, -72.11885 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 215 ft |
| Year Completed | 1830 (196 years old) |
Storage & Hydraulics
| NID Storage | 950 acre-ft |
| Max Storage | 950 acre-ft |
| Normal Storage | 465 acre-ft |
| Surface Area | 158 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 1,071 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | NH DNCR |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 04/30/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00233 |
| Federal ID | NH00233 |
| More Info | State Dam Safety Program |