Is Gratiot Lake Safe for Swimming?
Gratiot Lake in Keweenaw County, Michigan 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: 17 ft visibility. Phosphorus: 9 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Water Clarity (Secchi Depth) | 17 ft |
| Phosphorus | 9 μg/L |
| Maximum Depth | 70 ft |
| Location | Keweenaw County, Michigan |
How does Gratiot Lake compare?
On nutrient and algae readings, Gratiot Lake matches or beats the Michigan state average. It ranks #2 of 11 lakes in Keweenaw County on nutrient and algae readings.
Water clarity (Secchi depth) sits at 17 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae.
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