A
Turtle Flambeau Flowage - Big Water Lake
Iron County, Wisconsin
Water Quality Grade: A — Excellent
Crystal clear — you can see 19.7 feet down. Phosphorus level: 24.4 µg/L.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6 m | A |
| Phosphorus | 24.4 µg/L | B |
| Chlorophyll-a (Algae) | No data |
County Ranking
Ranked #41 of 50 lakes in Iron County
Data Sources
Data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-08-29
Monitoring stations: 1