Is Rush Lake Safe for Swimming?
Rush Lake in Chisago County, Minnesota has a water quality grade of F (Very Poor). Avoid swimming, very poor water quality, potential algae toxins. Water clarity: 3 ft visibility. Phosphorus: 55.5 µg/L. Chlorophyll-a (algae): 31.4 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | F (Very Poor) |
| Water Clarity (Secchi Depth) | 3 ft |
| Phosphorus | 55.5 μg/L |
| Chlorophyll-a (Algae) | 31.4 μg/L |
| Maximum Depth | 24 ft |
| Location | Chisago County, Minnesota |
How does Rush Lake compare?
With an overall water quality grade of F, Rush Lake falls below the Minnesota state average of Grade C. It ranks #26 of 30 lakes in Chisago County by water quality score.
Water clarity (Secchi depth) sits at 3 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 31.4 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.