Lakes / Illinois / Winnebago County / Lake Summerset
Lake Summerset, Illinois
271.32 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
42.45 degrees N, 89.40 degrees W - Winnebago 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 Lake Summerset Stacks Up
- Larger than 81% of the 511 lakes counted in Illinois.
- The largest lake in Winnebago County among those counted.
- About 20 miles from Rockford, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Victoria Lake | Winnebago | 18 mi | 74.63 acres |
| Levings Lake | Winnebago | 19 mi | 26.44 acres |
| Pearl Lake | Winnebago | 19 mi | 31.38 acres |
| Windsor Lake | Winnebago | 21 mi | 36.32 acres |
| Lake Le-Aqua-Na | Stephenson | 22 mi | 45.35 acres |
| Pierce Lake | Winnebago | 22 mi | 151.48 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Summerset
How Big Is Lake Summerset?
Lake Summerset covers 271.32 acres in Winnebago County, Illinois.
What Is the Largest Lake in Winnebago County?
Lake Summerset is the largest lake in Winnebago County, at 271.32 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 137423458). Verified October 30, 2026.