Is Blacktail Dam Lake Safe for Swimming?
Blacktail Dam Lake in Williams County, Wisconsin has a water quality grade of B (Good). Good for swimming, clear water with low algae levels. Water clarity: 7.2 ft visibility. Chlorophyll-a (algae): 8.6 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | B (Good) |
| Water Clarity (Secchi Depth) | 7.2 ft |
| Chlorophyll-a (Algae) | 8.6 μg/L |
| Location | Williams County, Wisconsin |
How does Blacktail Dam Lake compare?
With an overall water quality grade of B, Blacktail Dam Lake matches or beats the Wisconsin state average of Grade C. It ranks #3 of 9 lakes in Williams County by water quality score.
Water clarity (Secchi depth) sits at 7.2 feet. That puts the lake in good clarity range, with limited algae interference. Algae levels (chlorophyll-a) measure 8.6 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.