Is North Lake Safe for Swimming?
North Lake in Cass County, Wisconsin has a water quality grade of F (Very Poor). Avoid swimming, very poor water quality, potential algae toxins. Water clarity: 1.6 ft visibility. Phosphorus: 152 µg/L. Chlorophyll-a (algae): 60.3 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | F (Very Poor) |
| Water Clarity (Secchi Depth) | 1.6 ft |
| Phosphorus | 152 μg/L |
| Chlorophyll-a (Algae) | 60.3 μg/L |
| Location | Cass County, Wisconsin |
How does North Lake compare?
With an overall water quality grade of F, North Lake falls below the Wisconsin state average of Grade C. It ranks #5 of 5 lakes in Cass County by water quality score.
Water clarity (Secchi depth) sits at 1.6 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 60.3 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.