Is South Stanchfield Lake Safe for Swimming?
South Stanchfield Lake in Isanti County, Minnesota has a water quality grade of F (Very Poor). Avoid swimming, very poor water quality, potential algae toxins. Water clarity: 2.5 ft visibility. Phosphorus: 119 µg/L. Chlorophyll-a (algae): 33.4 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | F (Very Poor) |
| Water Clarity (Secchi Depth) | 2.5 ft |
| Phosphorus | 119 μg/L |
| Chlorophyll-a (Algae) | 33.4 μg/L |
| Maximum Depth | 17 ft |
| Location | Isanti County, Minnesota |
How does South Stanchfield Lake compare?
With an overall water quality grade of F, South Stanchfield Lake falls below the Minnesota state average of Grade C. It ranks #19 of 19 lakes in Isanti County by water quality score.
Water clarity (Secchi depth) sits at 2.5 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 33.4 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.