Lakes / Illinois / McHenry County / Crystal Lake
Crystal Lake, McHenry County, Illinois
230.06 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
42.23 degrees N, 88.36 degrees W - McHenry 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 Crystal Lake Stacks Up
- Larger than 78% of the 511 lakes counted in Illinois.
- About 38 miles from Rockford, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Vulcan Lakes | McHenry | 2.9 mi | 275.77 acres |
| Lake in the Hills | McHenry | 4.0 mi | 54.36 acres |
| Lake Killarney | McHenry | 5.0 mi | 59.55 acres |
| Silver Lake | McHenry | 5.5 mi | 43.74 acres |
| Wold Lake | McHenry | 6.8 mi | 65.24 acres |
| Griswold Lake | McHenry | 8.0 mi | 153.45 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Crystal Lake
How Big Is Crystal Lake?
Crystal Lake covers 230.06 acres in McHenry County, Illinois.
What Is the Largest Lake in McHenry County?
Pistakee Lake is the largest lake in McHenry County, at 1,743.58 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 121628055). Verified October 30, 2026.