Harris Brook Reservoir Dam is an earth dam located in Grafton County, New Hampshire, built in 1903. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 22 ft22 ft tall and 755 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Harris Brook Reservoir Dam
The primary purpose of Harris Brook Reservoir Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Enfield Water Department (local government). It impounds the Harris Brook near Canaan.
The dam stands 22 feet tall and stretches 755 feet across, creates a reservoir covering 21 acres, has a maximum storage capacity of 208 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1903, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 11/03/2022.
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Location
| State | New Hampshire |
| County | Grafton |
| Nearest City | Canaan |
| River/Stream | Harris Brook |
| Coordinates | 43.66250, -72.15080 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 755 ft |
| Year Completed | 1903 (123 years old) |
Storage & Hydraulics
| NID Storage | 208 acre-ft |
| Max Storage | 208 acre-ft |
| Normal Storage | 132 acre-ft |
| Surface Area | 21 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 919 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Enfield Water Department |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 11/03/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00354 |
| Federal ID | NH00354 |
| More Info | State Dam Safety Program |