Is Black Brook Flowage Lake Safe for Swimming?
Black Brook Flowage Lake in Polk County, Wisconsin has a water quality grade of B (Good). Good for swimming, clear water with low algae levels. Water clarity: 10.5 ft visibility. Phosphorus: 46.6 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | B (Good) |
| Water Clarity (Secchi Depth) | 10.5 ft |
| Phosphorus | 46.6 μg/L |
| Location | Polk County, Wisconsin |
How does Black Brook Flowage Lake compare?
With an overall water quality grade of B, Black Brook Flowage Lake matches or beats the Wisconsin state average of Grade C. It ranks #33 of 73 lakes in Polk County by water quality score.
Water clarity (Secchi depth) sits at 10.5 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae.