Is Sullivan Lake Safe for Swimming?
Sullivan Lake in Morrison County, Minnesota has a water quality grade of A (Excellent). Excellent for swimming, crystal clear water with minimal algae. Water clarity: 10.8 ft visibility. Phosphorus: 14 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | A (Excellent) |
| Water Clarity (Secchi Depth) | 10.8 ft |
| Phosphorus | 14 μg/L |
| Maximum Depth | 57 ft |
| Location | Morrison County, Minnesota |
How does Sullivan Lake compare?
With an overall water quality grade of A, Sullivan Lake matches or beats the Minnesota state average of Grade C. It ranks #4 of 16 lakes in Morrison County by water quality score.
Water clarity (Secchi depth) sits at 10.8 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae.