How Clean Is Big Swan Lake?
Big Swan Lake has fair water quality — typical of lakes with moderate nutrient enrichment. It received a water quality grade of C (Fair) based on EPA monitoring data. Water clarity (Secchi depth): 8.9 ft. Trophic State Index: 46.
Cleanliness Snapshot
| Metric | Big Swan Lake | Minnesota avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 8.9 ft | — |
| Trophic State Index | 46 | <50 = clean |
How does Big Swan Lake compare?
Big Swan Lake's grade of C matches or beats the Minnesota state average of C. It ranks #10 of 17 lakes in Todd County by water quality score. Multi-year monitoring data shows water quality is improving based on 5 years of records.