Winnebago County Lake Quality
Wisconsin, 6 lakes, measured by Wisconsin DNR
Winnebago County has 6 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. 2 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. The county's readings sit in the middle of the Wisconsin range, with one or two lakes pulling the average up or down depending on year.
The county's lakes lean shallow, which makes the readings sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest measured lake is Rush Lake.
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Quick Answers for Winnebago County
Planning a trip? Check special fishing regulations for Rush Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
Fishing in Winnebago County
DNR Reports (8)
Wisconsin DNR Fisheries Survey resources for lakes in Winnebago County. browse all reports →
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2025Community Park Ponds spring shocking survey, 2025Spring Shocking Survey · WI DNR · 2025 (PDF)
- 2025Ken Robl Pond spring shocking survey, 2025Spring Shocking Survey · WI DNR · 2025 (PDF)
- 2025Lake Winnebago bottom trawling assessment report, 2025Fisheries Survey · WI DNR · 2025 (PDF)
- 2025Winnebago System chironomid assessment report, 2025Fisheries Survey · WI DNR · 2025 (PDF)
- 2025Winnebago System sturgeon spawning and population assessment report 2025Fisheries Survey · WI DNR · 2025 (PDF)
- 2023Fond du Lac River and Van Dyne Creek fish passage study, 2023Fisheries Survey · WI DNR · 2023 (PDF)
- 2023Sunset Bay (Lake Butte des Morts) spring shocking survey, 2023Spring Shocking Survey · WI DNR · 2023 (PDF)
- 2023Winnebago System lake sturgeon acoustic telemetry report 2023Fisheries Survey · WI DNR · 2023 (PDF)
All Lakes in Winnebago County
6 lakes · 2 ranked on readings, 4 without enough sampling2 lakes ranked on readings · 4 without enough sampling, hidden
| # | Lake | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|
| 1 | Rush LakeWinnebago | 3.2 ft | 26 µg/L | No recent samples | No recent samples | 5 ft | ✓ Public |
| 2 | Little Lake Butte des MortsWinnebago | 2 ft | 133.5 µg/L | No recent samples | No recent samples | 18 ft | ✓ Public |
| Lake WinneconneWinnebago | 2.5 ft | No recent samples | No recent samples | No recent samples | 9 ft | ✓ Public | |
| Lake Butte des MortsWinnebago | 2.3 ft | No recent samples | No recent samples | No recent samples | 9 ft | ✓ Public | |
| Lake PoyganWinnebago | 2.5 ft | No recent samples | No recent samples | No recent samples | 11 ft | ✓ Public | |
| Lake WinnebagoWinnebago | No recent samples | No recent samples | No recent samples | No recent samples | 21 ft | ✓ Public |
NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.
Lake Match
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Source: the Wisconsin Department of Natural Resources. See data sources.