Lakes / Illinois / Putnam County
Lakes in Putnam County, Illinois
5 lakes counted in Putnam County - the largest is Senachwine Lake at 5,449.75 acres.
5
Lakes Counted
5,449.75 acres
Largest - Senachwine Lake
Putnam County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Senachwine Lake | Putnam | 5,449.75 acres | - |
| 2 | Sawmill Lake | Putnam | 556.48 acres | - |
| 3 | Swan Lake | Putnam | 167.31 acres | - |
| 4 | Coleman Lake | Putnam | 148.55 acres | - |
| 5 | Lake Thunderbird | Putnam | 107.24 acres | - |
Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.