Is Saint Croix Flowage Lake Safe for Swimming?
Saint Croix Flowage Lake in Douglas County, Wisconsin has a water quality grade of B (Good). Good for swimming, clear water with low algae levels. Water clarity: 10.5 ft visibility. Phosphorus: 23.8 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | B (Good) |
| Water Clarity (Secchi Depth) | 10.5 ft |
| Phosphorus | 23.8 μg/L |
| Location | Douglas County, Wisconsin |
How does Saint Croix Flowage Lake compare?
With an overall water quality grade of B, Saint Croix Flowage Lake matches or beats the Wisconsin state average of Grade C. It ranks #12 of 40 lakes in Douglas County by water quality score.
Water clarity (Secchi depth) sits at 10.5 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae.