How Clean Is Girl Lake?
Girl Lake is among the cleanest lakes in Minnesota. It received a water quality grade of A (Excellent) based on EPA monitoring data. Water clarity (Secchi depth): 17 ft. Phosphorus: 12 µg/L. Trophic State Index: 38.
Cleanliness Snapshot
| Metric | Girl Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 17 ft | — |
| Phosphorus | 12 µg/L | <30 = clean |
| Trophic State Index | 38 | <50 = clean |
How does Girl Lake compare?
Girl Lake's grade of A matches or beats the Minnesota state average of C. It ranks #6 of 133 lakes in Cass County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.