Is Loon Lake Safe for Swimming?
Loon Lake in Jackson County, Minnesota 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: 0.9 ft visibility. Phosphorus: 274 µg/L. Chlorophyll-a (algae): 110 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | F (Algae-prone) |
| Water Clarity (Secchi Depth) | 0.9 ft |
| Phosphorus | 274 μg/L |
| Chlorophyll-a (Algae) | 110 μg/L |
| Maximum Depth | 8 ft |
| Location | Jackson County, Minnesota |
How does Loon Lake compare?
With an overall water quality grade of F, Loon Lake falls below the Minnesota state average of Grade C. It ranks #5 of 6 lakes in Jackson County by water quality score.
Water clarity (Secchi depth) sits at 0.9 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 110 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.
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