St. Lawrence County Lake Quality
New York, 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 — or check the official New York fishing regulations.
All Lakes in St. Lawrence County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Silver Lake | A | 15.1 ft | - |
Other Counties in New York
See how St. Lawrence County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 15 states.
Where to stay near St. Lawrence County
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Source: EPA National Aquatic Resource Surveys, 2026.