Rock County Lake Quality
Wisconsin, 4 lakes, measured by Wisconsin DNR
Rock County has 4 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 Clear Lake.
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Quick Answers for Rock County
Planning a trip? Check special fishing regulations for Clear Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
Fishing in Rock County
DNR Reports (3)
Wisconsin DNR Fisheries Survey resources for lakes in Rock County. browse all reports →
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2025Rock River fall shocking survey, 2025Fisheries Survey · WI DNR · 2025 (PDF)
- 2025Turtle Creek smallmouth bass survey, 2025Fisheries Survey · WI DNR · 2025 (PDF)
- 2023Sugar River netting survey, 2023Netting Survey · WI DNR · 2023 (PDF)
All Lakes in Rock County
4 lakes · 2 ranked on readings, 2 without enough sampling2 lakes ranked on readings · 2 without enough sampling, hidden
| # | Lake | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|
| 1 | Clear LakeRock | 2.8 ft | 38.5 µg/L | No recent samples | No recent samples | 12 ft | ✓ Public |
| 2 | Leota LakeRock | 1.5 ft | 77 µg/L | No recent samples | No recent samples | 15 ft | ✓ Public |
| Rock River LakeRock | 21 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Gibbs LakeRock | No recent samples | No recent samples | No recent samples | No recent samples | 23 ft | ✓ Public |
NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.
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Other Counties in Wisconsin
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Source: the Wisconsin Department of Natural Resources. See data sources.