Safest Lakes to Swim Near Green Bay
Wisconsin
9 lakes within driving distance of Green Bay, 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.
A moderate cluster of 9 graded lakes lies within reach of Green Bay, averaging a grade of B. Oneida Lake (A) is the cleanest of the set.
The swimming-specific ranking layered on top of the LakeGrade rubric 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 | Oneida Lake | Outagamie | A | Low algae | 9.6 mi | - | - |
| 2 | Heidmann Lake | Kewaunee | A | Limited data | 18.9 mi | 15 ft | 34 ft |
| 3 | Tuma Lake | Manitowoc | A | Low algae | 20.9 mi | 10 ft | 36 ft |
| 4 | Finnegan Lake | Oconto | A | Low algae | 29.3 mi | 10 ft | 38 ft |
| 5 | Korth Lake | Shawano | A | Low algae | 30 mi | 12 ft | 48 ft |
| 6 | West Alaska Lake | Kewaunee | B | Low algae | 25.1 mi | 8.5 ft | 41 ft |
| 7 | East Alaska Lake | Kewaunee | B | Low algae | 25.5 mi | 9 ft | 50 ft |
| 8 | Krohns Lake | Kewaunee | B | Low algae | 26.3 mi | 8 ft | 38 ft |
| 9 | Pensaukee Lake | Shawano | B | Limited data | 28 mi | 10.5 ft | 49 ft |
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Source: EPA National Aquatic Resource Surveys, 2026.