Clay County Lake Quality
Wisconsin, 1 lakes, average grade A (Excellent)
Clay 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. The county's average grade is A — among the cleanest in Indiana. 1 lakes pull an A on their own, and almost none fall into the D or F brackets.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Wbu-07 Lake (A); the most-stressed is Wbu-07 Lake (A).
Quick Answers for Clay County
Planning a trip? Check special fishing regulations for Wbu-07 Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Clay County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Wbu-07 Lake | A | 18.9 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.