A
Thunder Lake, Cass County, Mn, Usa
Cass County, MinnesotaLimited Data
Water Quality Grade: A — Excellent
Crystal clear — you can see 20.0 feet down.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.1 m | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data |
County Ranking
Ranked #39 of 154 lakes in Cass County
Data Sources
Data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-07-04
Monitoring stations: 1