How Clean Is Lower Orono Lake?
Lower Orono 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): 2.3 ft. Phosphorus: 156 µg/L. Trophic State Index: 71.
Cleanliness Snapshot
| Metric | Lower Orono Lake | Minnesota avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 2.3 ft | — |
| Phosphorus | 156 µg/L | <30 = clean |
| Trophic State Index | 71 | <50 = clean |
How does Lower Orono Lake compare?
Lower Orono Lake's grade of F falls below the Minnesota state average of C. It ranks #24 of 24 lakes in Sherburne County by water quality score. Multi-year monitoring data shows water quality is improving based on 5 years of records.