How Clean Is Upper Cullen Lake?
Upper Cullen 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): 9.4 ft. Phosphorus: 23 µg/L. Trophic State Index: 47.
Cleanliness Snapshot
| Metric | Upper Cullen Lake | Minnesota avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 9.4 ft | — |
| Phosphorus | 23 µg/L | <30 = clean |
| Trophic State Index | 47 | <50 = clean |
How does Upper Cullen Lake compare?
Upper Cullen Lake's grade of B matches or beats the Minnesota state average of C. It ranks #99 of 120 lakes in Crow Wing County by water quality score. Multi-year monitoring data shows water quality is improving based on 5 years of records.