C
Thunder Lake -
Oconto County, Wisconsin
Water Quality Grade: C — Fair
Moderate clarity — visible to about 8.2 feet. Phosphorus level: 33.1 µg/L.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 m | C |
| Phosphorus | 33.1 µg/L | C |
| Chlorophyll-a (Algae) | No data |
County Ranking
Ranked #151 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: 2025-09-08
Monitoring stations: 1