Lakes / Illinois / Mercer County / Karl Lake
Karl Lake, Illinois
29.41 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
41.31 degrees N, 90.50 degrees W - Mercer 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 Karl Lake Stacks Up
- Larger than 10% of the 511 lakes counted in Illinois.
- About 64 miles from Peoria, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Frye Lake | Mercer | 0.8 mi | 118.86 acres |
| Bowles Slough | Rock Island | 11 mi | 37.56 acres |
| Lake George | Rock Island | 19 mi | 150.73 acres |
| Lake Warren | Warren | 23 mi | 42.26 acres |
| Lake Storey | Knox | 23 mi | 111.44 acres |
| Shadow Lake | Henry | 23 mi | 88.22 acres |
Straight-line distance between lake centers.
Facts and Figures
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 152591217). Verified October 30, 2026.