Is Saint Croix Flowage Lake Safe for Swimming?
Saint Croix Flowage Lake in Douglas County, Wisconsin has nutrient and algae measurements on record from state and federal monitoring. A water-quality reading is not a swimming clearance. The state water agency and county health departments post current advisories; check them before you swim.. Water clarity: 10.5 ft visibility. Phosphorus: 23.8 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft |
| Phosphorus | 23.8 μg/L |
| Location | Douglas County, Wisconsin |
How does Saint Croix Flowage Lake compare?
On nutrient and algae readings, Saint Croix Flowage Lake matches or beats the Wisconsin state average. It ranks #2 of 15 lakes in Douglas County on nutrient and algae readings.
Water clarity (Secchi depth) sits at 10.5 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae.
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