Is Johnson Lake Safe for Swimming?
Johnson Lake in Kandiyohi County, Minnesota has limited nutrient and algae sampling on record. 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: 1.6 ft visibility. Phosphorus: 96 µg/L. Chlorophyll-a (algae): 30.2 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft |
| Phosphorus | 96 μg/L |
| Chlorophyll-a (Algae) | 30.2 μg/L |
| Maximum Depth | 18 ft |
| Location | Kandiyohi County, Minnesota |
How does Johnson Lake compare?
Johnson Lake is not rated for water quality — it does not have enough recent summer sampling for a readings, so it is not compared with the Minnesota state average.
Water clarity (Secchi depth) sits at 1.6 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 30.2 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.
Watch Johnson Lake water quality
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