Is Keystone Lake Safe for Swimming?
Keystone Lake in Armstrong County, Pennsylvania 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.. Phosphorus: 12.5 µg/L. Chlorophyll-a (algae): 13.6 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Phosphorus | 12.5 μg/L |
| Chlorophyll-a (Algae) | 13.6 μg/L |
| Maximum Depth | 90 ft |
| Location | Armstrong County, Pennsylvania |
How does Keystone Lake compare?
On nutrient and algae readings, Keystone Lake matches or beats the Pennsylvania state average.
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