B
Fourmile Lake -
Oconto County, Wisconsin
Water Quality Grade: B — Good
Moderate clarity — visible to about 9.8 feet. Phosphorus level: 28.9 µg/L.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 m | C |
| Phosphorus | 28.9 µg/L | B |
| Chlorophyll-a (Algae) | No data |
County Ranking
Ranked #146 of 167 lakes in Oconto County
Data Sources
Data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-10-08
Monitoring stations: 1