Lakes / Illinois / Marion County / C and EI Reservoir
C and EI Reservoir, Illinois
45.96 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
38.63 degrees N, 88.93 degrees W - Marion 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 C and EI Reservoir Stacks Up
- Larger than 34% of the 511 lakes counted in Illinois.
- About 64 miles from Carbondale, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Salem Reservoir | Marion | 1.2 mi | 65.48 acres |
| Lake Centralia | Marion | 6.4 mi | 249.58 acres |
| Centralia Reservoir | Marion | 10 mi | 645.08 acres |
| Forbes Lake | Marion | 11 mi | 523.37 acres |
| Greendale Lake | Clay | 13 mi | 43.49 acres |
| Superior Lake | Jefferson | 16 mi | 35.34 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About C and EI Reservoir
How Big Is C and EI Reservoir?
C and EI Reservoir covers 45.96 acres in Marion County, Illinois.
What Is the Largest Lake in Marion County?
Centralia Reservoir is the largest lake in Marion County, at 645.08 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 155041362). Verified October 30, 2026.