Is Vermillion Lake Safe for Swimming?
Vermillion Lake in Cass County, Minnesota has nutrient and algae measurements on record from state and federal monitoring. 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: 12.6 ft visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 10 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Water Clarity (Secchi Depth) | 12.6 ft |
| Phosphorus | 25 μg/L |
| Chlorophyll-a (Algae) | 10 μg/L |
| Maximum Depth | 27 ft |
| Location | Cass County, Minnesota |
How does Vermillion Lake compare?
On nutrient and algae readings, Vermillion Lake matches or beats the Minnesota state average. It ranks #99 of 104 lakes in Cass County on nutrient and algae readings.
Water clarity (Secchi depth) sits at 12.6 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae. Algae levels (chlorophyll-a) measure 10 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.
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