Osage County Lake Quality
Wisconsin, 1 lakes, average grade D (Poor)
Only 1 lakes in Osage 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. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 0 lakes fall into the F bracket outright.
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 Ben Branch Lake by Dam (D); the most-stressed is Ben Branch Lake by Dam (D).
Quick Answers for Osage County
Planning a trip? Check special fishing regulations for Ben Branch Lake by Dam, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Osage County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Ben Branch Lake by Dam | D | 3.9 ft | - | 30.4 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.