Farrar Marsh Dam is a concrete dam located in Hillsborough, New Hampshire, built in 1978. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 11 ft11 ft tall and 110 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 Farrar Marsh Dam
The primary purpose of Farrar Marsh Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Nh Fish and Game Department (state). It impounds the Sand Brook near Hillsborough.
The dam stands 11 feet tall and stretches 110 feet across, creates a reservoir covering 140 acres, has a maximum storage capacity of 482 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1978, the structure is 48 years 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 11/02/2022.
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Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | Hillsborough |
| River/Stream | Sand Brook |
| Coordinates | 43.17330, -71.90377 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 110 ft |
| Year Completed | 1978 (48 years old) |
Storage & Hydraulics
| NID Storage | 482 acre-ft |
| Max Storage | 482 acre-ft |
| Normal Storage | 35 acre-ft |
| Surface Area | 140 acres |
| Drainage Area | 5 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Nh Fish and Game Department |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 11/02/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00501 |
| Federal ID | NH00501 |
| More Info | State Dam Safety Program |