Safest Lakes to Swim Near Oshkosh
Wisconsin
1 lakes within driving distance of Oshkosh, Wisconsin pass our swim-safety screen — grade A/B water, low algae, and public access. 0 have direct bacteria (E. coli) testing on record. Filtered for grade A or B water quality, low algae (chlorophyll-a under 15 µg/L), and public access. Always check local advisories on the day you swim.
Lakes near Oshkosh are sparser (1 graded lakes within reach), so the choices are limited. Green Lake (A) is the standout.
The swimming-specific ranking layered on top of the letter grade is what produces the list below: a grade-good lake that does not also support the swimming use case is less useful than a grade-decent lake that does.
| # | Lake | County | Grade | Swim Safety | Distance | Clarity | Depth |
|---|---|---|---|---|---|---|---|
| 1 | Green Lake | Green Lake | A | Low algae | 26.9 mi | 13.5 ft | 236 ft |
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Where to stay near Oshkosh
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Top-rated places to stay near Oshkosh
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Source: EPA National Aquatic Resource Surveys, 2026.