Hopkinton is a concrete dam located in Merrimack County, New Hampshire, built in 1890. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 325 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 Hopkinton
The primary purpose of Hopkinton 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 Town of Hopkinton, Nh (local government). It impounds the Contoocook River near Hopkinton.
The dam stands 10 feet tall and stretches 325 feet across, creates a reservoir covering 110 acres, has a maximum storage capacity of 380 acre-feet, and collects water from a drainage area of 437 square miles. Completed in 1890, 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 07/26/2018.
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Location
| State | New Hampshire |
| County | Merrimack |
| Nearest City | Hopkinton |
| River/Stream | Contoocook River |
| Coordinates | 43.22200, -71.71550 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 325 ft |
| Year Completed | 1890 (136 years old) |
Storage & Hydraulics
| NID Storage | 380 acre-ft |
| Max Storage | 380 acre-ft |
| Normal Storage | 380 acre-ft |
| Surface Area | 110 acres |
| Drainage Area | 437 sq mi |
| Max Discharge | 7,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Town of Hopkinton, Nh |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/26/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00204 |
| Federal ID | NH00204 |
| More Info | State Dam Safety Program |