Lakes / Illinois / LaSalle County / Split Rock Lake
Split Rock Lake, Illinois
162.6 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
41.33 degrees N, 89.06 degrees W - LaSalle 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 Split Rock Lake Stacks Up
- Larger than 72% of the 511 lakes counted in Illinois.
- About 52 miles from Peoria, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Huse Lake | LaSalle | 2.1 mi | 101.56 acres |
| Turner Lake | Bureau | 10 mi | 240.68 acres |
| Depue Lake | Bureau | 13 mi | 531.28 acres |
| Coleman Lake | Putnam | 14 mi | 148.55 acres |
| Spring Lake | Bureau | 15 mi | 225.85 acres |
| Hickory Ridge Lake | Bureau | 15 mi | 62.02 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Split Rock Lake
How Big Is Split Rock Lake?
Split Rock Lake covers 162.6 acres in LaSalle County, Illinois.
What Is the Largest Lake in LaSalle County?
LaSalle County Nuclear Station Cooling Pond is the largest lake in LaSalle County, at 1,976.08 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 152224718). Verified October 30, 2026.