Winona County Lake Quality
Minnesota, 1 lakes, average grade D (Poor)
Only 1 lakes in Winona 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. On average, Winona County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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 Winona Lake (D); the most-stressed is Winona Lake (D).
Quick Answers for Winona County
Planning a trip? Check special fishing regulations for Winona Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Minnesota regulations index.
DNR Reports (3)
Minnesota DNR LakeFinder resources for lakes in Winona County. browse all reports →
- —Fisheries Lake Survey — WinonaFisheries Lake Survey · MN DNR LakeFinder
- —Fish Stocking History — WinonaFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — WinonaPublic Water Access Sites · MN DNR LakeFinder
All Lakes in Winona County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Winona Lake | D | 2.6 ft | 38 ft | 51.5 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.