A
Mcdonald Lake -
Vernon County, Wisconsin
Water Quality Grade: A — Excellent
Crystal clear — you can see 26.9 feet down. Phosphorus level: 20.5 µg/L.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.19 m | A |
| Phosphorus | 20.5 µg/L | B |
| Chlorophyll-a (Algae) | No data |
County Ranking
Ranked #199 of 245 lakes in Vernon County
Data Sources
Data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-08-23
Monitoring stations: 1