Lewis County Lake Quality
Wisconsin, 1 lakes, average grade D (Poor)
Lewis County has 1 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, Lewis 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 Deer Ridge Comm. Lake (D); the most-stressed is Deer Ridge Comm. Lake (D).
Quick Answers for Lewis County
Planning a trip? Check special fishing regulations for Deer Ridge Comm. Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Lewis County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Deer Ridge Comm. Lake | D | 2.9 ft | - | 44 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.