Is Decatur Lake Safe for Swimming?
Decatur Lake in Macon County, Wisconsin has a water quality grade of F (Very Poor). Avoid swimming, very poor water quality, potential algae toxins. Water clarity: 1.3 ft visibility. Phosphorus: 90 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | F (Very Poor) |
| Water Clarity (Secchi Depth) | 1.3 ft |
| Phosphorus | 90 μg/L |
| Location | Macon County, Wisconsin |
How does Decatur Lake compare?
With an overall water quality grade of F, Decatur Lake falls below the Wisconsin state average of Grade D. It ranks #1 of 1 lakes in Macon County by water quality score.
Water clarity (Secchi depth) sits at 1.3 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff.