Otis Falls
Otis Falls is a concrete dam located in Hillsborough, New Hampshire, built in 1982. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Otis Falls
The primary purpose of Otis Falls is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Alden Hydro, Llc (private). It impounds the Souhegan River near Greenville.
The dam stands 27 feet tall and stretches 150 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 64 acre-feet, and collects water from a drainage area of 30 square miles. Completed in 1982, the structure is 44 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 09/30/2022.
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Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | Greenville |
| River/Stream | Souhegan River |
| Coordinates | 42.76690, -71.81220 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 150 ft |
| Year Completed | 1982 (44 years old) |
Storage & Hydraulics
| NID Storage | 64 acre-ft |
| Max Storage | 64 acre-ft |
| Normal Storage | 64 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 30 sq mi |
| Max Discharge | 3,327 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Alden Hydro, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/30/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00041 |
| Federal ID | NH00041 |
| More Info | State Dam Safety Program |