Granby
Granby is a masonry dam located in Oswego County, New York, built in 1926. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Granby
The primary purpose of Granby 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 New York State Canal Corporation (state). It impounds the Oswego River near Fulton.
The dam stands 15 feet tall and stretches 509 feet across, creates a reservoir covering 33 acres, has a maximum storage capacity of 620 acre-feet, and collects water from a drainage area of 5,018 square miles. Completed in 1926, the structure is well-established, with more than 75 years of service.
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 06/28/2022.
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Location
| State | New York |
| County | Oswego |
| Nearest City | Fulton |
| River/Stream | Oswego River |
| Coordinates | 43.32340, -76.42020 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 509 ft |
| Year Completed | 1926 (100 years old) |
Storage & Hydraulics
| NID Storage | 620 acre-ft |
| Max Storage | 620 acre-ft |
| Normal Storage | 620 acre-ft |
| Surface Area | 33 acres |
| Drainage Area | 5,018 sq mi |
| Max Discharge | 37,500 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | New York State Canal Corporation |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/28/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY00406 |
| Federal ID | NY00406 |
| More Info | State Dam Safety Program |