Ammonoosuc River is a concrete dam located in Grafton County, New Hampshire, built in 1900. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 17 ft17 ft tall and 365 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 Ammonoosuc River
The primary purpose of Ammonoosuc River 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 Bath Electric Power Company LLC (private). It impounds the Ammonoosuc River near Bath.
The dam stands 17 feet tall and stretches 365 feet across, creates a reservoir covering 24 acres, has a maximum storage capacity of 352 acre-feet, and collects water from a drainage area of 395 square miles. Completed in 1900, 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 08/17/2022.
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Location
| State | New Hampshire |
| County | Grafton |
| Nearest City | Bath |
| River/Stream | Ammonoosuc River |
| Coordinates | 44.16680, -71.96690 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 365 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 352 acre-ft |
| Max Storage | 352 acre-ft |
| Normal Storage | 280 acre-ft |
| Surface Area | 24 acres |
| Drainage Area | 395 sq mi |
| Max Discharge | 40,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Bath Electric Power Company LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/17/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00061 |
| Federal ID | NH00061 |
| More Info | State Dam Safety Program |