Ayers Pond Dam
Ayers Pond Dam is a concrete dam located in Strafford County, New Hampshire, built in 1810. It carries a Significant hazard potential classification and has a fair condition assessment.
About Ayers Pond Dam
The primary purpose of Ayers 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 Des Water Division (state). It impounds the Tr Isinglass River near Barrington.
The dam stands 18 feet tall and stretches 375 feet across, creates a reservoir covering 236 acres, has a maximum storage capacity of 1,767 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1810, 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 11/08/2021.
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Location
| State | New Hampshire |
| County | Strafford |
| Nearest City | Barrington |
| River/Stream | Tr Isinglass River |
| Coordinates | 43.24830, -71.05800 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 375 ft |
| Year Completed | 1810 (216 years old) |
Storage & Hydraulics
| NID Storage | 1,767 acre-ft |
| Max Storage | 1,767 acre-ft |
| Normal Storage | 1,059 acre-ft |
| Surface Area | 236 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 180 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | NH DES WATER DIVISION |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 11/08/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00162 |
| Federal ID | NH00162 |
| More Info | State Dam Safety Program |