Is Lake St. Croix Safe for Swimming?
Lake St. Croix in Washington County, Minnesota has a water quality grade of B (Good). Good for swimming, clear water with low algae levels. Water clarity: 5.2 ft visibility. Phosphorus: 18 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | B (Good) |
| Water Clarity (Secchi Depth) | 5.2 ft |
| Phosphorus | 18 μg/L |
| Maximum Depth | 78 ft |
| Location | Washington County, Minnesota |
How does Lake St. Croix compare?
With an overall water quality grade of B, Lake St. Croix matches or beats the Minnesota state average of Grade C. It ranks #9 of 31 lakes in Washington County by water quality score.
Water clarity (Secchi depth) sits at 5.2 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment.