Kewaunee County Lake Quality
Wisconsin, 4 lakes, average grade A (Excellent)
Kewaunee County has 4 graded 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. The county's average grade is A — among the cleanest in Wisconsin. 4 lakes pull an A on their own, and almost none fall into the D or F brackets.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Krohns Lake (A) is the cleanest in the county.
Quick Answers for Kewaunee County
Planning a trip? Check special fishing regulations for Krohns Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
DNR Reports (7)
Wisconsin DNR Fisheries Survey resources for lakes in Kewaunee County. browse all reports →
- 2025Shea Lake spring survey, 2025Fisheries Survey · WI DNR · 2025 (PDF)
- 2024East Alaska Lake spring survey, 2024Fisheries Survey · WI DNR · 2024 (PDF)
- 2021Krohns Lake spring shocking survey, 2021Spring Shocking Survey · WI DNR · 2021 (PDF)
- 2019West Alaska Lake spring survey 2019Fisheries Survey · WI DNR · 2019 (PDF)
- 2017East Alaska Lake spring survey 2017Fisheries Survey · WI DNR · 2017 (PDF)
- 2017Shea Lake spring survey 2017Fisheries Survey · WI DNR · 2017 (PDF)
- 2016Heidman (Bolt) Lake spring survey 2016Fisheries Survey · WI DNR · 2016 (PDF)
All Lakes in Kewaunee County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Krohns Lake | A | 26.2 ft | 38 ft | 11.6 µg/L |
| 2 | East Alaska Lake | A | 28.7 ft | 50 ft | 16.4 µg/L |
| 3 | West Alaska Lake | A | 27.9 ft | 41 ft | 14.1 µg/L |
| 4 | Sheas Lake | A | 17.9 ft | 24 ft | - |
Source: EPA National Aquatic Resource Surveys, 2026.