Otter Brook Dam is an earth dam located in Hillsborough, New Hampshire, built in 1928. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 150 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 Otter Brook Dam
The primary purpose of Otter Brook Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mr John Beale (private). It impounds the Otter Brook near Peterborough.
The dam stands 10 feet tall and stretches 150 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 70 acre-feet, and collects water from a drainage area of 8 square miles. Completed in 1928, 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 05/13/2022.
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Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | Peterborough |
| River/Stream | Otter Brook |
| Coordinates | 42.93770, -71.90080 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 150 ft |
| Year Completed | 1928 (98 years old) |
Storage & Hydraulics
| NID Storage | 70 acre-ft |
| Max Storage | 70 acre-ft |
| Normal Storage | 59 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 8 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Mr John Beale |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/13/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00495 |
| Federal ID | NH00495 |
| More Info | State Dam Safety Program |