How Clean Is Lake Butte des Morts?
Lake Butte des Morts does not have enough monitoring data to grade. Its EPA monitoring record does not meet the evidence bar for a letter grade, so it is published unrated — that is an absence of evidence, not a poor result. The measurements below are what the record does contain. Water clarity (Secchi depth): 2.3 ft. Trophic State Index: 65.
Cleanliness Snapshot
| Metric | Lake Butte des Morts | Wisconsin avg |
|---|---|---|
| Overall Grade | NR | B |
| Water Clarity (Secchi) | 2.3 ft | — |
| Trophic State Index | 65 | <50 = clean |
How does Lake Butte des Morts compare?
Lake Butte des Morts is not rated for water quality — its monitoring record does not meet the evidence bar, so it is not compared with the Wisconsin state average. Multi-year monitoring data shows water quality is stable based on 5 years of records.