How Clean Is Clark Lake?
Clark Lake is a clean lake by Wisconsin standards. It received a water quality grade of B (Good) based on EPA monitoring data. Water clarity (Secchi depth): 12.5 ft. Phosphorus: 10.5 µg/L. Trophic State Index: 39.
Cleanliness Snapshot
| Metric | Clark Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | B | B |
| Water Clarity (Secchi) | 12.5 ft | — |
| Phosphorus | 10.5 µg/L | <30 = clean |
| Trophic State Index | 39 | <50 = clean |
How does Clark Lake compare?
Clark Lake's grade of B matches or beats the Wisconsin state average of B. It ranks #2 of 5 lakes in Door County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.