Osceola County Lake Quality
Wisconsin, 6 lakes, average grade A (Excellent)
Osceola County has 6 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 Michigan. 5 lakes pull an A on their own, and almost none fall into the D or F brackets.
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. Center Lake (A) is the cleanest in the county.
Quick Answers for Osceola County
Planning a trip? Check special fishing regulations for Center Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Osceola County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Center Lake | A | 15 ft | - | - |
| 2 | Center Lake | A | 15 ft | - | - |
| 3 | Diamond Lake South Central Basin; Burdell Township Section 34 | A | 16 ft | - | - |
| 4 | Diamond Lake | A | 16 ft | - | - |
| 5 | Rose Lake East Basin; Rose Lake Township | A | 11.5 ft | - | - |
| 6 | Rose Lake | B | 10.8 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.