Is Upper Estuary Lake Safe for Swimming?
Upper Estuary Lake in St. Louis 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: 1.9 ft visibility. Phosphorus: 49.5 µg/L. Chlorophyll-a (algae): 1.7 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Water Clarity (Secchi Depth) | 1.9 ft |
| Phosphorus | 49.5 μg/L |
| Chlorophyll-a (Algae) | 1.7 μg/L |
| Maximum Depth | 55 ft |
| Location | St. Louis County, Minnesota |
How does Upper Estuary Lake compare?
On nutrient and algae readings, Upper Estuary Lake matches or beats the Minnesota state average. It ranks #62 of 68 lakes in St. Louis County on nutrient and algae readings.
Water clarity (Secchi depth) sits at 1.9 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 1.7 µg/L — low and well within safe swimming guidelines.
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