Monadnock
Monadnock is a concrete dam located in Hillsborough, New Hampshire, built in 1923. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Monadnock
The primary purpose of Monadnock 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 Monadnock Paper Mills, Inc. (private). It impounds the Contoocook River near Bennington.
The dam stands 22 feet tall and stretches 500 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 240 acre-feet, and collects water from a drainage area of 190 square miles. Completed in 1923, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 06/15/2017.
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Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | Bennington |
| River/Stream | Contoocook River |
| Coordinates | 42.99970, -71.92570 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 500 ft |
| Year Completed | 1923 (103 years old) |
Storage & Hydraulics
| NID Storage | 240 acre-ft |
| Max Storage | 240 acre-ft |
| Normal Storage | 217 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 190 sq mi |
| Max Discharge | 13,400 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Monadnock Paper Mills, Inc. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/15/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00249 |
| Federal ID | NH00249 |
| More Info | State Dam Safety Program |