Lakes / Illinois / Williamson County
Lakes in Williamson County, Illinois
14 lakes counted in Williamson County - the largest is Crab Orchard Lake at 7,292.57 acres.
14
Lakes Counted
7,292.57 acres
Largest - Crab Orchard Lake
Williamson County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Crab Orchard Lake | Williamson | 7,292.57 acres | - |
| 2 | Little Grassy Lake | Williamson | 905.39 acres | - |
| 3 | Devils Kitchen Lake | Williamson | 711.91 acres | - |
| 4 | Marion Reservoir | Williamson | 245.13 acres | - |
| 5 | Johnston City Lake | Williamson | 59.8 acres | - |
| 6 | Herrin Lake | Williamson | 52.39 acres | - |
| 7 | Herrin Reservoir | Williamson | 50.41 acres | - |
| 8 | Marion Country Club Lake | Williamson | 42.18 acres | - |
| 9 | Pond 17 | Williamson | 39.04 acres | - |
| 10 | Sweet Lake | Williamson | 36.57 acres | - |
| 11 | Fresh Water Lake | Williamson | 35.83 acres | - |
| 12 | Teal Lake | Williamson | 29.65 acres | - |
| 13 | Lake Number 5 | Williamson | 26.69 acres | - |
| 14 | Madison Lake | Williamson | 26.19 acres | - |
Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.