Kane County Lake Quality
Wisconsin, 1 lakes, average grade B (Good)
Kane County has 1 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. With an average grade of B, Kane County sits comfortably above the Illinois median.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Big Rock Lake (B) is the cleanest in the county.
Quick Answers for Kane County
Planning a trip? Check special fishing regulations for Big Rock Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Kane County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Big Rock Lake | B | 8.1 ft | - | 10 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.