How Clean Is Clark Lake?
Clark 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): 41 ft. Phosphorus: 10.5 µg/L. Trophic State Index: 31.
Cleanliness Snapshot
| Metric | Clark Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | A | B |
| Water Clarity (Secchi) | 41 ft | — |
| Phosphorus | 10.5 µg/L | <30 = clean |
| Trophic State Index | 31 | <50 = clean |
How does Clark Lake compare?
Clark Lake's grade of A matches or beats the Wisconsin state average of B. It ranks #1 of 11 lakes in Door County by water quality score. Multi-year monitoring data shows water quality is improving based on 7 years of records.