O'Neill Forebay Reservoir
| Reservoir Name | O'Neill Forebay Reservoir |
| Dam Name | O'Neill Forebay Dike |
| River | Offstream San Luis Creek |
| Administration City | California |
| Country | United States |
| Year | 1966 |
| Dam Height | 5 |
| Dam Length | 580 |
| Area(Sqkm) | 8.7 |
| Area(Polygonal) | 8.7 |
| Capital Expenditure | 79.9 |
| Depth(M) | 9.2 |
| Avg Displacement Of Water | 109 |
| Catchment Area In Sqkm | 329 |
| Main Usage | Hydroelectricity |
| Status | 3: Fair |
| Longitude | -121.049583 |
| Latitude | 37.095417 |
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