Winona County Lake Quality
Minnesota, 1 lake, average grade F (Algae-prone)
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. The county average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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 (F); the most-stressed is Winona Lake (F).
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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 →
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —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
1 lake1 graded lake
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | FWinona LakeWinona | F | 2.6 ft | 51.5 µg/L | 33.3 µg/L | No recent samples | 38 ft | ✓ Public |
Lake Match
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Other Counties in Minnesota
See how Winona County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 39 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.