How Clean Is Yellowstone Lake?
Yellowstone Lake has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Water clarity (Secchi depth): 1.3 ft. Phosphorus: 156 µg/L. Trophic State Index: 75.
Cleanliness Snapshot
| Metric | Yellowstone Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | D | B |
| Water Clarity (Secchi) | 1.3 ft | — |
| Phosphorus | 156 µg/L | <30 = clean |
| Trophic State Index | 75 | <50 = clean |
How does Yellowstone Lake compare?
Yellowstone Lake's grade of D falls below the Wisconsin state average of B. It ranks #2 of 2 lakes in Lafayette County by water quality score. Multi-year monitoring data shows water quality is improving based on 5 years of records.