Lake Decatur Reservoir
| Reservoir Name | Lake Decatur |
| Dam Name | Lake Decatur Dam |
| River | Sangamon River |
| Administration City | Illinois |
| Country | United States |
| Year | 1922 |
| Dam Height | 10 |
| Dam Length | 527 |
| Area(Sqkm) | 10.9 |
| Area(Polygonal) | 10.9 |
| Capital Expenditure | 71 |
| Depth(M) | 6.5 |
| Avg Displacement Of Water | 24231 |
| Catchment Area In Sqkm | 2365 |
| Main Usage | Water supply |
| Status | 2: Good |
| Longitude | -88.955417 |
| Latitude | 39.824583 |
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