How Clean Is Rush Lake?
Rush Lake has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Water clarity (Secchi depth): 3 ft. Phosphorus: 61 µg/L. Chlorophyll-a (algae): 29.5 µg/L. Trophic State Index: 63.
Cleanliness Snapshot
| Metric | Rush Lake | Minnesota avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 3 ft | — |
| Phosphorus | 61 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 29.5 µg/L | <10 = clean |
| Trophic State Index | 63 | <50 = clean |
How does Rush Lake compare?
Rush Lake's grade of D falls below the Minnesota state average of C. It ranks #26 of 31 lakes in Chisago County by water quality score. Multi-year monitoring data shows water quality is improving based on 5 years of records.