St. Lawrence County Lake Quality
Wisconsin, 1 lakes, average grade A (Excellent)
St. Lawrence 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, St. Lawrence County lakes grade an A. That puts it near the top of the New York county ranking.
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 Silver Lake (A); the most-stressed is Silver Lake (A).
Quick Answers for St. Lawrence County
Planning a trip? Check special fishing regulations for Silver Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in St. Lawrence County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Silver Lake | A | 15.1 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.