Sauk County Lake Quality
Wisconsin, 11 lakes, average grade C (Fair)
Sauk County has 11 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. Sauk County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Dutch Hollow Lake (B); the most-stressed is Lake Redstone (D).
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Quick Answers for Sauk County
Planning a trip? Check special fishing regulations for Dutch Hollow Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
Fishing in Sauk County
DNR Reports (2)
Wisconsin DNR Fisheries Survey resources for lakes in Sauk County. browse all reports →
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2024Devils Lake creel survey, 2024Creel Survey · WI DNR · 2024 (PDF)
- 2024Devils Lake comprehensive fishery survey, 2024Comprehensive Survey · WI DNR · 2024 (PDF)
All Lakes in Sauk County
11 lakes · 7 graded, 4 not rated7 graded lakes · 4 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | BDutch Hollow LakeSauk | B | 15 ft | 13.1 µg/L | No recent samples | No recent samples | 38 ft | ✓ Public |
| 2 | BBakkens PondSauk | B | 2.5 ft | 23.3 µg/L | No recent samples | No recent samples | No recent samples | ✓ Public |
| 3 | CLong LakeSauk | C | 4.1 ft | 27.9 µg/L | No recent samples | No recent samples | No recent samples | ✓ Public |
| 4 | CWhite Mound LakeSauk | C | 5.5 ft | 30.1 µg/L | No recent samples | No recent samples | 16 ft | ✓ Public |
| 5 | DLake RedstoneSauk | D | 2 ft | 89 µg/L | No recent samples | No recent samples | No recent samples | ✓ Public |
| 6 | DMirror LakeSauk | D | 4.6 ft | 65.4 µg/L | No recent samples | No recent samples | No recent samples | ✓ Public |
| 7 | DHill Slough LakeSauk | D | 4.4 ft | 42.7 µg/L | No recent samples | No recent samples | No recent samples | Not recorded |
| NRLake DeltonSauk | NR | 2.5 ft | No recent samples | No recent samples | No recent samples | 16 ft | ✓ Public | |
| NRLake Wisconsin Palisade Street BaySauk | NR | 2.6 ft | No recent samples | No recent samples | No recent samples | 24 ft | ✓ Public | |
| NRDevils LakeSauk | NR | No recent samples | No recent samples | No recent samples | No recent samples | 47 ft | ✓ Public | |
| NRBuckhorn LakeSauk | NR | No recent samples | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
Lake Match
Which lake suits how you actually use one?
Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.
Other Counties in Wisconsin
See how Sauk County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 39 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.