O'Sullivan Dam
Washington — Grant County
Location
| State | Washington |
| County | Grant |
| Coordinates | 46.98200, -119.29080 |
Physical Characteristics
| NID Height | 200 ft |
| Dam Height | 200 ft |
| Dam Length | 19,000 ft |
| NID Storage | 546,300 acre-ft |
| Max Storage | 546,300 acre-ft |
| Surface Area | 27,800 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Not Available |
| EAP Status | — |
| Last Inspection | — |
| Inspection Frequency | 4 |
Dam Information
| Year Completed | 1949 |
| Primary Purpose | Flood Risk Reduction |
| Dam Type | — |
| Owner Type | — |
| Owner | BUREAU OF RECLAMATION |
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.