How Clean Is Riley Lake?
Riley 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): 12.6 ft. Phosphorus: 20 µg/L. Trophic State Index: 44.
Cleanliness Snapshot
| Metric | Riley Lake | Minnesota avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 12.6 ft | — |
| Phosphorus | 20 µg/L | <30 = clean |
| Trophic State Index | 44 | <50 = clean |
How does Riley Lake compare?
Riley Lake's grade of B matches or beats the Minnesota state average of C. It ranks #3 of 95 lakes in Hennepin County by water quality score. Multi-year monitoring data shows water quality is declining based on 5 years of records.