How Clean Is Lake Marseilles-Terre du Lac Lakes?
Lake Marseilles-Terre du Lac Lakes 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): 14.1 ft. Phosphorus: 7.4 µg/L. Chlorophyll-a (algae): 2.4 µg/L. Trophic State Index: 37.
Cleanliness Snapshot
| Metric | Lake Marseilles-Terre du Lac Lakes | Wisconsin avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 14.1 ft | — |
| Phosphorus | 7.4 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 2.4 µg/L | <10 = clean |
| Trophic State Index | 37 | <50 = clean |
How does Lake Marseilles-Terre du Lac Lakes compare?
Lake Marseilles-Terre du Lac Lakes's grade of A matches or beats the Wisconsin state average of C. It ranks #2 of 4 lakes in St. Francois County by water quality score.