Is Jacksonville Lake Safe for Swimming?
Jacksonville Lake in Morgan 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: 60.5 µg/L. Chlorophyll-a (algae): 42.2 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 | 60.5 μg/L |
| Chlorophyll-a (Algae) | 42.2 μg/L |
| Location | Morgan County, Illinois |
How does Jacksonville Lake compare?
With an overall water quality grade of F, Jacksonville Lake falls below the Illinois state average of Grade D. It ranks #1 of 2 lakes in Morgan 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 42.2 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.
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