Lakes / Illinois / Union County / Bluff Lake
Bluff Lake, Union County, Illinois
61.53 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
37.38 degrees N, 89.35 degrees W - Union 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 Bluff Lake Stacks Up
- Larger than 44% of the 511 lakes counted in Illinois.
- About 25 miles from Carbondale, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Anna State Hospital Reservoir | Union | 7.3 mi | 27.68 acres |
| Dongola Lake | Union | 9.8 mi | 63.51 acres |
| Wolf Lake | Union | 11 mi | 59.8 acres |
| Tower Island Chute | Jackson | 17 mi | 294.06 acres |
| Horseshoe Lake | Alexander | 17 mi | 1,784.84 acres |
| Cedar Lake | Jackson | 18 mi | 1,614.59 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Bluff Lake
How Big Is Bluff Lake?
Bluff Lake covers 61.53 acres in Union County, Illinois.
What Is the Largest Lake in Union County?
Dongola Lake is the largest lake in Union County, at 63.51 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 44746587). Verified October 30, 2026.