Is Black Oak Lake Safe for Swimming?
Black Oak Lake in Vilas County, Wisconsin has a water quality grade of B (Good). Good for swimming, clear water with low algae levels. Water clarity: 29 ft visibility. Phosphorus: 10.6 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | B (Good) |
| Water Clarity (Secchi Depth) | 29 ft |
| Phosphorus | 10.6 μg/L |
| Maximum Depth | 85 ft |
| Location | Vilas County, Wisconsin |
How does Black Oak Lake compare?
With an overall water quality grade of B, Black Oak Lake matches or beats the Wisconsin state average of Grade B. It ranks #41 of 103 lakes in Vilas County by water quality score.
Water clarity (Secchi depth) sits at 29 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae.