Hannawa is a gravity dam located in St. Lawrence County, New York, built in 1902. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 34 ft34 ft tall and 255 ft long, taller than 78% 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 Hannawa
The primary purpose of Hannawa 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 Erie Boulevard Hydropower, L.p. (private). It impounds the Raquette River near Potsdam.
The dam stands 34 feet tall and stretches 255 feet across, creates a reservoir covering 204 acres, has a maximum storage capacity of 690 acre-feet, and collects water from a drainage area of 993 square miles. Completed in 1902, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 05/13/2019.
At 34 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | New York |
| County | St. Lawrence |
| Nearest City | Potsdam |
| River/Stream | Raquette River |
| Coordinates | 44.61200, -74.97470 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 34 ft |
| Dam Height | 34 ft |
| Dam Length | 255 ft |
| Year Completed | 1902 (124 years old) |
Storage & Hydraulics
| NID Storage | 690 acre-ft |
| Max Storage | 690 acre-ft |
| Normal Storage | 690 acre-ft |
| Surface Area | 204 acres |
| Drainage Area | 993 sq mi |
| Max Discharge | 12,700 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Erie Boulevard Hydropower, L.p. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/13/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY00250 |
| Federal ID | NY00250 |
| More Info | State Dam Safety Program |