A
St. Marys Lake
St. Louis County, Minnesota
Water Quality Grade: A — Excellent
Crystal clear — you can see 16.8 feet down. Phosphorus level: 7.5 µg/L.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.11 m | A |
| Phosphorus | 7.5 µg/L | A |
| Chlorophyll-a (Algae) | No data |
County Ranking
Ranked #20 of 198 lakes in St. Louis County
Data Sources
Data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-09-21
Monitoring stations: 1