Is High Island Lake Safe for Swimming?
High Island Lake in Sibley County, Minnesota has a water quality grade of F (Very Poor). Avoid swimming, very poor water quality, potential algae toxins. Water clarity: 2.1 ft visibility. Phosphorus: 180 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | F (Very Poor) |
| Water Clarity (Secchi Depth) | 2.1 ft |
| Phosphorus | 180 μg/L |
| Maximum Depth | 6.5 ft |
| Location | Sibley County, Minnesota |
How does High Island Lake compare?
With an overall water quality grade of F, High Island Lake falls below the Minnesota state average of Grade C. It ranks #2 of 2 lakes in Sibley County by water quality score.
Water clarity (Secchi depth) sits at 2.1 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff.