Renville County Lake Quality
Wisconsin, 3 lakes, average grade C (Fair)
Renville County has 3 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. Renville County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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 Lake Darling (B); the most-stressed is Lake Darling (C).
Quick Answers for Renville County
Planning a trip? Check special fishing regulations for Lake Darling, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Renville County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Lake Darling | B | 4.9 ft | - | - |
| 2 | Lake Darling | B | 9.8 ft | - | - |
| 3 | Lake Darling | C | 5.4 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.