Lakes / Wisconsin / Rock County
Lakes in Rock County, Wisconsin
1 lakes counted in Rock County - the largest is Lake Koshkonong at 10,595 acres.
1
Lakes Counted
10,595 acres
Largest - Lake Koshkonong
7 ft
Deepest - Lake Koshkonong
Rock County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Koshkonong | Jefferson, Dane, Rock | 10,595 acres | 7 ft |
Sources: Wisconsin DNR lake data; USGS. Verified October 28, 2026.