Juneau County Lake Quality
Wisconsin, 2 lakes, average grade D (Nutrient-rich)
Juneau County has 2 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. On average, Juneau County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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 Petenwell Flowage Lake (D); the most-stressed is Petenwell Flowage Lake (D).
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Quick Answers for Juneau County
Planning a trip? Check special fishing regulations for Petenwell Flowage Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
Fishing in Juneau County
All Lakes in Juneau County
2 lakes2 graded lakes
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | DPetenwell Flowage LakeJuneau | D | 2.3 ft | 81.7 µg/L | No recent samples | No recent samples | 44 ft | ✓ Public |
| 2 | DDecorah LakeJuneau | D | No recent samples | 116 µg/L | No recent samples | No recent samples | 15 ft | ✓ Public |
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 Juneau 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.