How Clean Is Red Rock Lake?
Red Rock Lake is algae-prone, with a higher bloom risk in warm months. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 3.6 ft. Phosphorus: 55 µg/L. Chlorophyll-a (algae): 33.7 µg/L. Trophic State Index: 62.
Cleanliness Snapshot
| Metric | Red Rock Lake | Minnesota avg |
|---|---|---|
| Water Clarity (Secchi) | 3.6 ft | — |
| Phosphorus | 55 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 33.7 µg/L | <10 = clean |
| Trophic State Index | 62 | <50 = clean |
How does Red Rock Lake compare?
Red Rock Lake's readings run above the Minnesota state average. It ranks #34 of 37 lakes in Douglas County on nutrient and algae readings. Multi-year monitoring data shows water quality is declining based on 6 years of records.
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