How Clean Is Marion Lake?
Marion Lake has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Phosphorus: 71 µg/L. Trophic State Index: 66.
Cleanliness Snapshot
| Metric | Marion Lake | Minnesota avg |
|---|---|---|
| Overall Grade | D | C |
| Phosphorus | 71 µg/L | <30 = clean |
| Trophic State Index | 66 | <50 = clean |
How does Marion Lake compare?
Marion Lake's grade of D falls below the Minnesota state average of C. It ranks #1 of 5 lakes in McLeod County by water quality score.