Back Lake Dam
Back Lake Dam is a concrete dam located in Coos County, New Hampshire, built in 1930. It carries a Low hazard potential classification and has a poor condition assessment.
About Back Lake Dam
The primary purpose of Back 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 Fish And Game Department (state). It impounds the Back Lake Brook near Pittsburg.
The dam stands 7 feet tall and stretches 36 feet across, creates a reservoir covering 348 acres, has a maximum storage capacity of 1,269 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1930, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 06/16/2022.
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Location
| State | New Hampshire |
| County | Coos |
| Nearest City | Pittsburg |
| River/Stream | Back Lake Brook |
| Coordinates | 45.08330, -71.36410 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 36 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 1,269 acre-ft |
| Max Storage | 1,269 acre-ft |
| Normal Storage | 574 acre-ft |
| Surface Area | 348 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 207 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | NH FISH AND GAME DEPARTMENT |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/16/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00584 |
| Federal ID | NH00584 |
| More Info | State Dam Safety Program |