Big Brook Bog Dam is an earth dam located in Coos County, New Hampshire, built in 1946. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 11 ft11 ft tall and 370 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 Big Brook Bog Dam
The primary purpose of Big Brook Bog 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 Big Brook near Pittsburg.
The dam stands 11 feet tall and stretches 370 feet across, creates a reservoir covering 36 acres, has a maximum storage capacity of 250 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1946, the structure is well-established, with more than 75 years of service.
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 09/15/2020.
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Location
| State | New Hampshire |
| County | Coos |
| Nearest City | Pittsburg |
| River/Stream | Big Brook |
| Coordinates | 45.16050, -71.22580 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 370 ft |
| Year Completed | 1946 (80 years old) |
Storage & Hydraulics
| NID Storage | 250 acre-ft |
| Max Storage | 250 acre-ft |
| Normal Storage | 107 acre-ft |
| Surface Area | 36 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 991 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Nh Fish and Game Department |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/15/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00457 |
| Federal ID | NH00457 |
| More Info | State Dam Safety Program |