Is Carlyle Lake Safe for Swimming?
Carlyle Lake in Clinton 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: 1.8 ft visibility. Phosphorus: 238.5 µg/L. Chlorophyll-a (algae): 38.8 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | F (Algae-prone) |
| Water Clarity (Secchi Depth) | 1.8 ft |
| Phosphorus | 238.5 μg/L |
| Chlorophyll-a (Algae) | 38.8 μg/L |
| Location | Clinton County, Illinois |
How does Carlyle Lake compare?
With an overall water quality grade of F, Carlyle Lake falls below the Illinois state average of Grade D. It ranks #1 of 1 lakes in Clinton County by water quality score.
Water clarity (Secchi depth) sits at 1.8 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 38.8 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.
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