How Clean Is Swan Lake?
Swan Lake is among the cleanest lakes in Minnesota. It received a water quality grade of A (Excellent) based on EPA monitoring data. Water clarity (Secchi depth): 13.5 ft. Phosphorus: 18 µg/L. Chlorophyll-a (algae): 5.2 µg/L. Trophic State Index: 44.
Cleanliness Snapshot
| Metric | Swan Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 13.5 ft | — |
| Phosphorus | 18 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 5.2 µg/L | <10 = clean |
| Trophic State Index | 44 | <50 = clean |
How does Swan Lake compare?
Swan Lake's grade of A matches or beats the Minnesota state average of C. It ranks #17 of 72 lakes in Itasca County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.