Lakes / Illinois / Hancock County / Rocky Run Lake
Rocky Run Lake, Illinois
43.74 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
40.27 degrees N, 91.41 degrees W - Hancock 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 Rocky Run Lake Stacks Up
- Larger than 31% of the 511 lakes counted in Illinois.
- The largest lake in Hancock County among those counted.
- About 99 miles from Springfield, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Little Rocky Run Lake | Hancock | 0.4 mi | 26.27 acres |
| Jennifer Creek Reservoir | Hancock | 1.6 mi | 26.42 acres |
| Camp Saukenauk Lake | Adams | 7.6 mi | 33.06 acres |
| Carthage Lake | Hancock | 17 mi | 42.5 acres |
| Goose Lake | Adams | 19 mi | 71.41 acres |
| Linda Lake | Hancock | 24 mi | 39.54 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Rocky Run Lake
How Big Is Rocky Run Lake?
Rocky Run Lake covers 43.74 acres in Hancock County, Illinois.
What Is the Largest Lake in Hancock County?
Rocky Run Lake is the largest lake in Hancock County, at 43.74 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 106627845). Verified October 30, 2026.