Rollinsford is a concrete dam located in Strafford County, New Hampshire, built in 1910. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 20 ft20 ft tall and 385 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Rollinsford
The primary purpose of Rollinsford is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Town of Rollinsford, Nh (local government). It impounds the Salmon Falls River near Rollinsford.
The dam stands 20 feet tall and stretches 385 feet across, creates a reservoir covering 57 acres, has a maximum storage capacity of 456 acre-feet, and collects water from a drainage area of 230 square miles. Completed in 1910, the structure is over a century old.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/19/2022.
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Location
| State | New Hampshire |
| County | Strafford |
| Nearest City | Rollinsford |
| River/Stream | Salmon Falls River |
| Coordinates | 43.23790, -70.81790 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 385 ft |
| Year Completed | 1910 (116 years old) |
Storage & Hydraulics
| NID Storage | 456 acre-ft |
| Max Storage | 456 acre-ft |
| Normal Storage | 456 acre-ft |
| Surface Area | 57 acres |
| Drainage Area | 230 sq mi |
| Max Discharge | 7,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Town of Rollinsford, Nh |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/19/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00396 |
| Federal ID | NH00396 |
| More Info | State Dam Safety Program |