How Clean Is Lake Montello?
Lake Montello has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Water clarity (Secchi depth): 6.1 ft. Trophic State Index: 51.
Cleanliness Snapshot
| Metric | Lake Montello | Wisconsin avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 6.1 ft | — |
| Trophic State Index | 51 | <50 = clean |
How does Lake Montello compare?
Lake Montello's grade of D falls below the Wisconsin state average of C. It ranks #12 of 13 lakes in Marquette County by water quality score. Multi-year monitoring data shows water quality is declining based on 2 years of records.