Lakes / Illinois / Putnam County / Sawmill Lake
Sawmill Lake, Illinois
556.48 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
41.12 degrees N, 89.33 degrees W - Putnam County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Sawmill Lake Stacks Up
- Larger than 87% of the 511 lakes counted in Illinois.
- About 33 miles from Peoria, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Swan Lake | Putnam | 3.0 mi | 167.31 acres |
| Billsbach Lake | Marshall | 3.4 mi | 871.79 acres |
| Lake Wildwood | Marshall | 4.2 mi | 209.79 acres |
| Senachwine Lake | Putnam | 5.0 mi | 5,449.75 acres |
| Goose Lake | Marshall | 6.5 mi | 1,113.46 acres |
| Lake Thunderbird | Putnam | 8.6 mi | 107.24 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Sawmill Lake
How Big Is Sawmill Lake?
Sawmill Lake covers 556.48 acres in Putnam County, Illinois.
What Is the Largest Lake in Putnam County?
Senachwine Lake is the largest lake in Putnam County, at 5,449.75 acres.
Largest Lakes in Illinois
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Carlyle Lake | Clinton | 22,796.77 acres | - |
| 2 | Mine Number 21 Reservoir | Franklin | 17,062.04 acres | - |
| 3 | Upper Peoria Lake | Woodford | 15,460.64 acres | - |
| 4 | Lake Shelbyville | Shelby | 10,235.1 acres | - |
| 5 | Crab Orchard Lake | Williamson | 7,292.57 acres | - |
All 511 Illinois lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 152225400). Verified October 30, 2026.