A
Birch Lake
Cook County, Minnesota
Water Quality Grade: A — Excellent
Crystal clear — you can see 18.0 feet down. Phosphorus level: 8 µg/L.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.49 m | A |
| Phosphorus | 8 µg/L | A |
| Chlorophyll-a (Algae) | No data |
County Ranking
Ranked #3 of 144 lakes in Cook County
Data Sources
Data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-02
Monitoring stations: 2