Union Street
Union Street is a concrete dam located in Hillsborough, New Hampshire, built in 1916. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Union Street
The primary purpose of Union Street 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 American Hydro Power Company (private). It impounds the Nubanusit Brook near West Peterborough.
The dam stands 15 feet tall and stretches 101 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 9 acre-feet, and collects water from a drainage area of 44 square miles. Completed in 1916, 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 07/19/2022.
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Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | West Peterborough |
| River/Stream | Nubanusit Brook |
| Coordinates | 42.88679, -71.98443 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 101 ft |
| Year Completed | 1916 (110 years old) |
Storage & Hydraulics
| NID Storage | 9 acre-ft |
| Max Storage | 9 acre-ft |
| Normal Storage | 9 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 44 sq mi |
| Max Discharge | 3,500 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | American Hydro Power Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/19/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH83031 |
| Federal ID | NH83031 |
| More Info | State Dam Safety Program |