How Clean Is Shell Lake?
Shell Lake is among the cleanest lakes in Wisconsin. It received a water quality grade of A (Excellent) based on EPA monitoring data. Water clarity (Secchi depth): 16 ft. Phosphorus: 15.2 µg/L. Trophic State Index: 40.
Cleanliness Snapshot
| Metric | Shell Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 16 ft | — |
| Phosphorus | 15.2 µg/L | <30 = clean |
| Trophic State Index | 40 | <50 = clean |
How does Shell Lake compare?
Shell Lake's grade of A matches or beats the Wisconsin state average of C. It ranks #5 of 47 lakes in Washburn County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.