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LakeQuality

How Clean Is Red Rock Lake?

Red Rock Lake has very poor water quality and a high algae bloom risk. It received a water quality grade of F (Very Poor) based on 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

MetricRed Rock LakeMinnesota avg
Overall GradeFC
Water Clarity (Secchi)3.6 ft
Phosphorus55 µg/L<30 = clean
Chlorophyll-a (Algae)33.7 µg/L<10 = clean
Trophic State Index62<50 = clean

How does Red Rock Lake compare?

Red Rock Lake's grade of F falls below the Minnesota state average of C. It ranks #34 of 37 lakes in Douglas County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.