Lakes / Illinois / Saline County / Eldorado Reservoir
Eldorado Reservoir, Illinois
106.26 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
37.83 degrees N, 88.49 degrees W - Saline 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 Eldorado Reservoir Stacks Up
- Larger than 63% of the 511 lakes counted in Illinois.
- About 40 miles from Carbondale, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Harrisburg Reservoir | Saline | 5.3 mi | 158.42 acres |
| Snockey Pond | Saline | 9.7 mi | 33.38 acres |
| Sandy Run Lake | White | 10 mi | 31.33 acres |
| Glen Jones Lake | Saline | 11 mi | 98.45 acres |
| Thompsonville Lake | Franklin | 16 mi | 43.98 acres |
| L P Dolan Lake | Hamilton | 17 mi | 72.34 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Eldorado Reservoir
How Big Is Eldorado Reservoir?
Eldorado Reservoir covers 106.26 acres in Saline County, Illinois.
What Is the Largest Lake in Saline County?
Harrisburg Reservoir is the largest lake in Saline County, at 158.42 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 49230263). Verified October 30, 2026.