Harrisville is a concrete dam located in Lewis County, New York, built in 1905. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 25 ft25 ft tall and 385 ft long, taller than 50% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Harrisville
The primary purpose of Harrisville 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 Eony Generation Limited (private). It impounds the West Branch Oswegatchie River near Harrisville.
The dam stands 25 feet tall and stretches 385 feet across, creates a reservoir covering 25 acres, has a maximum storage capacity of 84 acre-feet, and collects water from a drainage area of 198 square miles. Completed in 1905, the structure is over a century 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 07/26/2018.
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Location
| State | New York |
| County | Lewis |
| Nearest City | Harrisville |
| River/Stream | West Branch Oswegatchie River |
| Coordinates | 44.15480, -75.32020 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 385 ft |
| Year Completed | 1905 (121 years old) |
Storage & Hydraulics
| NID Storage | 84 acre-ft |
| Max Storage | 84 acre-ft |
| Normal Storage | 84 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 198 sq mi |
| Max Discharge | 8,500 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Eony Generation Limited |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/26/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NY00679 |
| Federal ID | NY00679 |
| More Info | State Dam Safety Program |