How Clean Is Rush Lake?
Rush Lake has very poor water quality and a high algae bloom risk. It received a water quality grade of F (Very Poor) based on EPA monitoring data. Water clarity (Secchi depth): 3 ft. Phosphorus: 55.5 µg/L. Chlorophyll-a (algae): 31.4 µg/L. Trophic State Index: 63.
Cleanliness Snapshot
| Metric | Rush Lake | Minnesota avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 3 ft | — |
| Phosphorus | 55.5 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 31.4 µg/L | <10 = clean |
| Trophic State Index | 63 | <50 = clean |
How does Rush Lake compare?
Rush Lake's grade of F falls below the Minnesota state average of C. It ranks #26 of 30 lakes in Chisago County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.