Cedar County Lake Quality
Wisconsin, 4 lakes, average grade B (Good)
Only 4 lakes in Cedar County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. With an average grade of B, Cedar County sits comfortably above the Missouri median.
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 Stockton Lake (A); the most-stressed is Stockton Lake (B).
Quick Answers for Cedar County
Planning a trip? Check special fishing regulations for Stockton Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Cedar County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Stockton Lake | A | - | - | 7 µg/L |
| 2 | Stockton Lake by Dam | B | 7.9 ft | - | 11 µg/L |
| 3 | Stockton Lake | B | 5.8 ft | - | 9.8 µg/L |
| 4 | Stockton State Park Marina Lake | B | 5.9 ft | - | 13 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.