How Clean Is Red Rock Lake?
Red Rock Lake is a clean lake by Minnesota standards. It received a water quality grade of B (Good) based on EPA monitoring data. Water clarity (Secchi depth): 12.7 ft. Trophic State Index: 41.
Cleanliness Snapshot
| Metric | Red Rock Lake | Minnesota avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 12.7 ft | — |
| Trophic State Index | 41 | <50 = clean |
How does Red Rock Lake compare?
Red Rock Lake's grade of B matches or beats the Minnesota state average of C. It ranks #44 of 128 lakes in Cook County by water quality score. Multi-year monitoring data shows water quality is declining based on 3 years of records.