Cheshire Mills
Cheshire Mills is a dam located in Cheshire County, New Hampshire, built in 1886. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Cheshire Mills
The primary purpose of Cheshire Mills 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 Historic Harrisville, Inc. (private). It impounds the Nubanusit Brook near Harrisville.
The dam stands 27 feet tall and stretches 94 feet across, creates a reservoir covering 0 acres, has a maximum storage capacity of 2 acre-feet, and collects water from a drainage area of 11 square miles. Completed in 1886, 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 08/25/2022.
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Location
| State | New Hampshire |
| County | Cheshire |
| Nearest City | Harrisville |
| River/Stream | Nubanusit Brook |
| Coordinates | 42.94470, -72.09330 |
Physical Characteristics
| NID Height | 27 ft |
| Dam Height | 21 ft |
| Dam Length | 94 ft |
| Year Completed | 1886 (140 years old) |
Storage & Hydraulics
| NID Storage | 2 acre-ft |
| Max Storage | 2 acre-ft |
| Normal Storage | 1 acre-ft |
| Surface Area | 0 acres |
| Drainage Area | 11 sq mi |
| Max Discharge | 600 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Historic Harrisville, Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/25/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00067 |
| Federal ID | NH00067 |
| More Info | State Dam Safety Program |