Is Loon Lake Safe for Swimming?
Loon Lake in Jackson County, Minnesota 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: 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 |
|---|---|
| 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?
On nutrient and algae readings, Loon Lake runs above the Minnesota state average. It ranks #5 of 6 lakes in Jackson County on nutrient and algae readings.
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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