Lakes / Illinois / St. Clair County / Grand Marais Lake
Grand Marais Lake, Illinois
83.23 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
38.58 degrees N, 90.09 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 Grand Marais Lake Stacks Up
- Larger than 55% of the 511 lakes counted in Illinois.
- The largest lake in St. Clair County among those counted.
- About 76 miles from Carbondale, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Spring Lake | St. Clair | 3.8 mi | 66.47 acres |
| Canteen Lake | Madison | 6.1 mi | 96.87 acres |
| Horseshoe Lake | Madison | 7.8 mi | 1,426.29 acres |
| McDonough Lake | Madison | 9.4 mi | 60.79 acres |
| Long Lake | Madison | 11 mi | 62.27 acres |
| Long Lake | Madison | 14 mi | 46.7 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Grand Marais Lake
How Big Is Grand Marais Lake?
Grand Marais Lake covers 83.23 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 79319238). Verified October 30, 2026.