Hewittville
Hewittville is a concrete dam located in St. Lawrence County, New York, built in 1870. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Hewittville
The primary purpose of Hewittville 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 Unionville.
The dam stands 18 feet tall and stretches 615 feet across, creates a reservoir covering 109 acres, has a maximum storage capacity of 360 acre-feet, and collects water from a drainage area of 1,036 square miles. Completed in 1870, the structure is one of the older dams in the region, with over a century and a half of service.
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 07/15/2019.
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Location
| State | New York |
| County | St. Lawrence |
| Nearest City | Unionville |
| River/Stream | Raquette River |
| Coordinates | 44.70400, -75.00780 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 615 ft |
| Year Completed | 1870 (156 years old) |
Storage & Hydraulics
| NID Storage | 360 acre-ft |
| Max Storage | 360 acre-ft |
| Normal Storage | 360 acre-ft |
| Surface Area | 109 acres |
| Drainage Area | 1,036 sq mi |
| Max Discharge | 11,500 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 | 07/15/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NY00574 |
| Federal ID | NY00574 |
| More Info | State Dam Safety Program |