Lakes / Illinois / Washington County / Calamus Lake
Calamus Lake, Illinois
31.88 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
38.42 degrees N, 89.66 degrees W - Washington 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 Calamus Lake Stacks Up
- Larger than 15% of the 511 lakes counted in Illinois.
- About 54 miles from Carbondale, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Big Forked Lake | Clinton | 11 mi | 26.69 acres |
| River King Mine Lake | St. Clair | 11 mi | 28.53 acres |
| Biebell Lake | St. Clair | 12 mi | 26.93 acres |
| Long Lake | Clinton | 14 mi | 25.45 acres |
| Brush Lake | St. Clair | 15 mi | 37.31 acres |
| City Reservoir | Randolph | 15 mi | 33.36 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Calamus Lake
How Big Is Calamus Lake?
Calamus Lake covers 31.88 acres in Washington County, Illinois.
What Is the Largest Lake in Washington County?
Washington County Lake is the largest lake in Washington County, at 287.14 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 98649400). Verified October 30, 2026.