Hermit Lake Dam
Hermit Lake Dam is an earth dam located in Belknap County, New Hampshire, built in 1927. It carries a Low hazard potential classification and has a fair condition assessment.
About Hermit Lake Dam
The primary purpose of Hermit Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Nh Des Water Division (state). It impounds the Salmon Brook near Sanbornton.
The dam stands 20 feet tall and stretches 1,320 feet across, creates a reservoir covering 220 acres, has a maximum storage capacity of 1,892 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1927, the structure is well-established, with more than 75 years of service.
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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 04/19/2021.
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Location
| State | New Hampshire |
| County | Belknap |
| Nearest City | Sanbornton |
| River/Stream | Salmon Brook |
| Coordinates | 43.55520, -71.60750 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 1,320 ft |
| Year Completed | 1927 (99 years old) |
Storage & Hydraulics
| NID Storage | 1,892 acre-ft |
| Max Storage | 1,892 acre-ft |
| Normal Storage | 1,233 acre-ft |
| Surface Area | 220 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 3,343 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | NH DES WATER DIVISION |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 04/19/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00033 |
| Federal ID | NH00033 |
| More Info | State Dam Safety Program |