Is Henry Sever Lake Safe for Swimming?
Henry Sever Lake in Knox County, Wisconsin has a water quality grade of D (Poor). Swimming not recommended, poor water quality with high algae risk. Water clarity: 2.1 ft visibility. Phosphorus: 58 µg/L. Chlorophyll-a (algae): 25.4 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | D (Poor) |
| Water Clarity (Secchi Depth) | 2.1 ft |
| Phosphorus | 58 μg/L |
| Chlorophyll-a (Algae) | 25.4 μg/L |
| Location | Knox County, Wisconsin |
How does Henry Sever Lake compare?
With an overall water quality grade of D, Henry Sever Lake falls below the Wisconsin state average of Grade C. It ranks #1 of 1 lakes in Knox County by water quality score.
Water clarity (Secchi depth) sits at 2.1 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 25.4 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.