How Clean Is Circle Lake?
Circle 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): 1.5 ft. Phosphorus: 484.5 µg/L. Chlorophyll-a (algae): 59.7 µg/L. Trophic State Index: 79.
Cleanliness Snapshot
| Metric | Circle Lake | Minnesota avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 1.5 ft | — |
| Phosphorus | 484.5 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 59.7 µg/L | <10 = clean |
| Trophic State Index | 79 | <50 = clean |
How does Circle Lake compare?
Circle Lake's grade of F falls below the Minnesota state average of C. It ranks #6 of 14 lakes in Rice County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.