Lake Jefferson
New York — Sullivan County — East Branch Callicoon Creek
Location
| State | New York |
| County | Sullivan |
| River | East Branch Callicoon Creek |
| Coordinates | 41.77740, -74.92530 |
Physical Characteristics
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 220 ft |
| NID Storage | 350 acre-ft |
| Max Storage | 350 acre-ft |
| Surface Area | 30 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Unsatisfactory |
| EAP Status | Yes |
| Last Inspection | June 5, 2025 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1927 |
| Primary Purpose | Hydroelectric |
| Dam Type | Gravity |
| Owner Type | Private |
| Owner | Barbara A. & Kevin J. Gref |
Location Map
About This Dam Record
Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.