How Clean Is Dutch Hollow Lake?
Dutch Hollow 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): 15 ft. Phosphorus: 13.1 µg/L. Trophic State Index: 40.
Cleanliness Snapshot
| Metric | Dutch Hollow Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 15 ft | — |
| Phosphorus | 13.1 µg/L | <30 = clean |
| Trophic State Index | 40 | <50 = clean |
How does Dutch Hollow Lake compare?
Dutch Hollow Lake's grade of A matches or beats the Wisconsin state average of C. It ranks #1 of 11 lakes in Sauk County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.