Is Shelbyville Lake Safe for Swimming?
Shelbyville Lake in Shelby County, Wisconsin has a water quality grade of F (Very Poor). Avoid swimming, very poor water quality, potential algae toxins. Water clarity: 1 ft visibility. Phosphorus: 252.5 µg/L. Chlorophyll-a (algae): 112.4 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | F (Very Poor) |
| Water Clarity (Secchi Depth) | 1 ft |
| Phosphorus | 252.5 μg/L |
| Chlorophyll-a (Algae) | 112.4 μg/L |
| Location | Shelby County, Wisconsin |
How does Shelbyville Lake compare?
With an overall water quality grade of F, Shelbyville Lake falls below the Wisconsin state average of Grade C. It ranks #2 of 2 lakes in Shelby County by water quality score.
Water clarity (Secchi depth) sits at 1 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 112.4 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.