Noone Mills is a concrete dam located in Hillsborough, New Hampshire, built in 1938. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 14 ft14 ft tall and 176 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 Noone Mills
The primary purpose of Noone 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 The Cobbs, LLC (private). It impounds the Contoocook River near Peterborough.
The dam stands 14 feet tall and stretches 176 feet across, creates a reservoir covering 19 acres, has a maximum storage capacity of 135 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1938, the structure is well-established, with more than 75 years 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 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 07/18/2022.
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Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | Peterborough |
| River/Stream | Contoocook River |
| Coordinates | 42.85960, -71.96140 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 176 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 135 acre-ft |
| Max Storage | 135 acre-ft |
| Normal Storage | 135 acre-ft |
| Surface Area | 19 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 8,800 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | The Cobbs, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/18/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00427 |
| Federal ID | NH00427 |
| More Info | State Dam Safety Program |