Lakes / Illinois / Union County / Anna State Hospital Reservoir
Anna State Hospital Reservoir, Illinois
27.68 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
37.47 degrees N, 89.29 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 Anna State Hospital Reservoir Stacks Up
- Larger than 7% of the 511 lakes counted in Illinois.
- About 18 miles from Carbondale, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Bluff Lake | Union | 7.3 mi | 61.53 acres |
| Wolf Lake | Union | 8.6 mi | 59.8 acres |
| Dongola Lake | Union | 10.0 mi | 63.51 acres |
| Cedar Lake | Jackson | 11 mi | 1,614.59 acres |
| Tower Island Chute | Jackson | 14 mi | 294.06 acres |
| Little Grassy Lake | Williamson | 14 mi | 905.39 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Anna State Hospital Reservoir
How Big Is Anna State Hospital Reservoir?
Anna State Hospital Reservoir covers 27.68 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 44746451). Verified October 30, 2026.