Theresa is a gravity dam located in Jefferson County, New York, built in 1929. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 40 ft40 ft tall and 127 ft long, taller than 86% 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 Theresa
The primary purpose of Theresa 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 Niagara Mohawk Power Corp. (private). It impounds the Indian River near Theresa.
The dam stands 40 feet tall and stretches 127 feet across, creates a reservoir covering 75 acres, has a maximum storage capacity of 482 acre-feet, and collects water from a drainage area of 323 square miles. Completed in 1929, the structure is well-established, with more than 75 years 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 06/15/2022.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | New York |
| County | Jefferson |
| Nearest City | Theresa |
| River/Stream | Indian River |
| Coordinates | 44.21740, -75.79450 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 127.4 ft |
| Year Completed | 1929 (97 years old) |
Storage & Hydraulics
| NID Storage | 482 acre-ft |
| Max Storage | 482 acre-ft |
| Normal Storage | 482 acre-ft |
| Surface Area | 75 acres |
| Drainage Area | 323 sq mi |
| Max Discharge | 2,300 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Niagara Mohawk Power Corp. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/15/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NY00407 |
| Federal ID | NY00407 |
| More Info | State Dam Safety Program |