Is Roberds Lake Safe for Swimming?
Roberds Lake in Rice 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: 300 µg/L. Chlorophyll-a (algae): 86.7 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 | 300 μg/L |
| Chlorophyll-a (Algae) | 86.7 μg/L |
| Maximum Depth | 43 ft |
| Location | Rice County, Minnesota |
How does Roberds Lake compare?
With an overall water quality grade of F, Roberds Lake falls below the Minnesota state average of Grade C. It ranks #4 of 14 lakes in Rice 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 86.7 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.