Is Mattoon Lake Safe for Swimming?
Mattoon Lake in Cumberland County, Illinois has nutrient and algae measurements on record from state and federal monitoring. Chlorophyll-a in the monitoring record runs high enough that algae is a factor. A water-quality reading is not a swimming clearance. The state water agency and county health departments post current advisories; check them before you swim.. Water clarity: 1.3 ft visibility. Phosphorus: 294 µg/L. Chlorophyll-a (algae): 87.1 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Water Clarity (Secchi Depth) | 1.3 ft |
| Phosphorus | 294 μg/L |
| Chlorophyll-a (Algae) | 87.1 μg/L |
| Location | Cumberland County, Illinois |
How does Mattoon Lake compare?
On nutrient and algae readings, Mattoon Lake runs above the Illinois state average. It ranks #1 of 1 lakes in Cumberland County on nutrient and algae readings.
Water clarity (Secchi depth) sits at 1.3 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 87.1 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.
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