Jackson Mills is a concrete dam located in Hillsborough, New Hampshire, built in 1920. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 33 ft33 ft tall and 330 ft long, taller than 76% of U.S. dams with a recorded height. 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 Jackson Mills
The primary purpose of Jackson 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 City of Nashua, Nh (local government). It impounds the Nashua River near Nashua.
The dam stands 33 feet tall and stretches 330 feet across, creates a reservoir covering 40 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 529 square miles. Completed in 1920, 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 08/24/2022.
At 33 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | Nashua |
| River/Stream | Nashua River |
| Coordinates | 42.76360, -71.46370 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 330 ft |
| Year Completed | 1920 (106 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 150 acre-ft |
| Surface Area | 40 acres |
| Drainage Area | 529 sq mi |
| Max Discharge | 36,795 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | City of Nashua, Nh |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/24/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00121 |
| Federal ID | NH00121 |
| More Info | State Dam Safety Program |