Souhegan Site 8 South Dike is an earth dam located in Hillsborough, New Hampshire, built in 1977. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 9 ft9 ft tall and 330 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 Souhegan Site 8 South Dike
The primary purpose of Souhegan Site 8 South Dike is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Nh Des Water Division (state). It impounds the Tr Souhegan River near Lyndeborough.
The dam stands 9 feet tall and stretches 330 feet across, creates a reservoir covering 48 acres, has a maximum storage capacity of 170 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1977, the structure is 49 years old.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 04/24/2020.
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Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | Lyndeborough |
| River/Stream | Tr Souhegan River |
| Coordinates | 42.87470, -71.75500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 330 ft |
| Year Completed | 1977 (49 years old) |
Storage & Hydraulics
| NID Storage | 170 acre-ft |
| Max Storage | 170 acre-ft |
| Normal Storage | 130 acre-ft |
| Surface Area | 48 acres |
| Drainage Area | 4 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Nh Des Water Division |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/24/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH01074 |
| Federal ID | NH01074 |
| More Info | State Dam Safety Program |