How Clean Is Yellowstone Lake?
Yellowstone 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): 1.2 ft. Phosphorus: 156 µg/L. Trophic State Index: 76.
Cleanliness Snapshot
| Metric | Yellowstone Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 1.2 ft | — |
| Phosphorus | 156 µg/L | <30 = clean |
| Trophic State Index | 76 | <50 = clean |
How does Yellowstone Lake compare?
Yellowstone Lake's grade of F falls below the Wisconsin state average of C. It ranks #3 of 3 lakes in Lafayette County by water quality score. Multi-year monitoring data shows water quality is improving based on 5 years of records.