Is Raccoon Lake Safe for Swimming?
Raccoon Lake in Marion County, Illinois has a water quality grade of F (Algae-prone). Algae and nutrients are often high — check current advisories before swimming. Skip the water if you see scum or a paint-like bloom. Water clarity: 1.2 ft visibility. Phosphorus: 285 µg/L. Chlorophyll-a (algae): 73.5 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | F (Algae-prone) |
| Water Clarity (Secchi Depth) | 1.2 ft |
| Phosphorus | 285 μg/L |
| Chlorophyll-a (Algae) | 73.5 μg/L |
| Location | Marion County, Illinois |
How does Raccoon Lake compare?
With an overall water quality grade of F, Raccoon Lake falls below the Illinois state average of Grade D. It ranks #4 of 6 lakes in Marion County by water quality score.
Water clarity (Secchi depth) sits at 1.2 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 73.5 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.
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