Is Upper Cullen Lake Safe for Swimming?
Upper Cullen Lake in Crow Wing County, Minnesota 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: 8.7 ft visibility. Phosphorus: 23 µg/L. Chlorophyll-a (algae): 6.8 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Water Clarity (Secchi Depth) | 8.7 ft |
| Phosphorus | 23 μg/L |
| Chlorophyll-a (Algae) | 6.8 μg/L |
| Maximum Depth | 40 ft |
| Location | Crow Wing County, Minnesota |
How does Upper Cullen Lake compare?
With an overall water-quality readings of —, Upper Cullen Lake matches or beats the Minnesota state average. It ranks #56 of 85 lakes in Crow Wing County by water quality score.
Water clarity (Secchi depth) sits at 8.7 feet. That puts the lake in good clarity range, with limited algae interference. Algae levels (chlorophyll-a) measure 6.8 µg/L — low and well within safe swimming guidelines.
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