Lakes / Illinois / St. Clair County / Brush Lake
Brush Lake, Illinois
37.31 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
38.32 degrees N, 89.91 degrees W - St. Clair 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 Brush Lake Stacks Up
- Larger than 23% of the 511 lakes counted in Illinois.
- About 56 miles from Carbondale, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Biebell Lake | St. Clair | 4.4 mi | 26.93 acres |
| Round Pond | St. Clair | 4.7 mi | 51.65 acres |
| Baldwin Lake | Randolph | 7.5 mi | 1,874.85 acres |
| River King Mine Lake | St. Clair | 8.8 mi | 28.53 acres |
| Waterloo New Reservoir | Monroe | 14 mi | 35.09 acres |
| Calamus Lake | Washington | 15 mi | 31.88 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Brush Lake
How Big Is Brush Lake?
Brush Lake covers 37.31 acres in St. Clair County, Illinois.
What Is the Largest Lake in St. Clair County?
Grand Marais Lake is the largest lake in St. Clair County, at 83.23 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 98652724). Verified October 30, 2026.