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 (A); the most-stressed is Lake Redstone (F).
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.
DNR Reports (2)
Wisconsin DNR Fisheries Survey resources for lakes in Sauk County. browse all reports →
- 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
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Dutch Hollow Lake | A | 15 ft | 38 ft | 13.1 µg/L |
| 2 | Buckhorn Lake | A | - | - | 12 µg/L |
| 3 | Long Lake | C | 4.1 ft | - | 27.9 µg/L |
| 4 | White Mound Lake | C | 5 ft | 16 ft | 28.4 µg/L |
| 5 | Devils Lake | C | 7.3 ft | 47 ft | - |
| 6 | Bakkens Pond | C | 2.5 ft | - | 23.3 µg/L |
| 7 | Hill Slough Lake | C | 4.4 ft | - | 42.7 µg/L |
| 8 | Mirror Lake | D | 4.6 ft | - | 65.4 µg/L |
| 9 | Lake Redstone | F | 2 ft | - | 92 µg/L |
| 10 | Lake Delton | F | 2.5 ft | 16 ft | - |
| 11 | Lake Wisconsin Palisade Street Bay | F | 2.6 ft | 24 ft | - |
Source: EPA National Aquatic Resource Surveys, 2026.