First Conn Lake South Bay Dike
First Conn Lake South Bay Dike is an earth dam located in Coos County, New Hampshire. It carries a Low hazard potential classification and has a fair condition assessment.
About First Conn Lake South Bay Dike
The primary purpose of First Conn Lake South Bay Dike is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Great River Hydro Llc (private). It impounds the Connecticut River near Pittsburg.
The dam stands 14 feet tall and stretches 390 feet across, creates a reservoir covering 2,800 acres, has a maximum storage capacity of 38,950 acre-feet, and collects water from a drainage area of 82 square miles.
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 09/16/2020.
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Location
| State | New Hampshire |
| County | Coos |
| Nearest City | Pittsburg |
| River/Stream | Connecticut River |
| Coordinates | 45.06690, -71.25250 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 390 ft |
Storage & Hydraulics
| NID Storage | 38,950 acre-ft |
| Max Storage | 38,950 acre-ft |
| Normal Storage | 15,950 acre-ft |
| Surface Area | 2,800 acres |
| Drainage Area | 82 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | GREAT RIVER HYDRO LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 09/16/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH01012 |
| Federal ID | NH01012 |
| More Info | State Dam Safety Program |