Lakes / Illinois / Saline County / Harrisburg Reservoir
Harrisburg Reservoir, Illinois
158.42 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
37.85 degrees N, 88.59 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 Harrisburg Reservoir Stacks Up
- Larger than 71% of the 511 lakes counted in Illinois.
- The largest lake in Saline County among those counted.
- About 35 miles from Carbondale, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Eldorado Reservoir | Saline | 5.3 mi | 106.26 acres |
| Thompsonville Lake | Franklin | 11 mi | 43.98 acres |
| New City Lake | Franklin | 12 mi | 205.53 acres |
| West Frankfort Reservoir | Franklin | 12 mi | 158.64 acres |
| Sandy Run Lake | White | 14 mi | 31.33 acres |
| Snockey Pond | Saline | 14 mi | 33.38 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Harrisburg Reservoir
How Big Is Harrisburg Reservoir?
Harrisburg Reservoir covers 158.42 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 49229921). Verified October 30, 2026.