South Edwards is a concrete dam located in St. Lawrence County, New York, built in 1914. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 53 ft53 ft tall and 214 ft long, taller than 93% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About South Edwards
The primary purpose of South Edwards 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 East Branch Oswegatchie River near South Edwards.
The dam stands 53 feet tall and stretches 214 feet across, creates a reservoir covering 81 acres, has a maximum storage capacity of 851 acre-feet, and collects water from a drainage area of 277 square miles. Completed in 1914, the structure is over a century 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 06/15/2022.
At 53 feet, this dam is taller than 93% of dams nationwide.
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Location
| State | New York |
| County | St. Lawrence |
| Nearest City | South Edwards |
| River/Stream | East Branch Oswegatchie River |
| Coordinates | 44.26650, -75.19210 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 53 ft |
| Dam Height | 48 ft |
| Dam Length | 214.5 ft |
| Year Completed | 1914 (112 years old) |
Storage & Hydraulics
| NID Storage | 851 acre-ft |
| Max Storage | 851 acre-ft |
| Normal Storage | 851 acre-ft |
| Surface Area | 81 acres |
| Drainage Area | 277 sq mi |
| Max Discharge | 5,104 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Erie Boulevard Hydropower, L.p. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/15/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY00415 |
| Federal ID | NY00415 |
| More Info | State Dam Safety Program |