Is Red Rock Lake Safe for Swimming?
Red Rock Lake in Douglas County, Minnesota has nutrient and algae measurements on record from state and federal monitoring. Chlorophyll-a in the monitoring record runs high enough that algae is a factor. 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: 3.6 ft visibility. Phosphorus: 55 µg/L. Chlorophyll-a (algae): 33.7 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Water Clarity (Secchi Depth) | 3.6 ft |
| Phosphorus | 55 μg/L |
| Chlorophyll-a (Algae) | 33.7 μg/L |
| Maximum Depth | 22 ft |
| Location | Douglas County, Minnesota |
How does Red Rock Lake compare?
With an overall water-quality readings of —, Red Rock Lake runs above the Minnesota state average. It ranks #34 of 37 lakes in Douglas County by water quality score.
Water clarity (Secchi depth) sits at 3.6 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 33.7 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.
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