How Clean Is South Twin Lake?
South Twin 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): 10.2 ft. Phosphorus: 14 µg/L. Trophic State Index: 43.
Cleanliness Snapshot
| Metric | South Twin Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 10.2 ft | — |
| Phosphorus | 14 µg/L | <30 = clean |
| Trophic State Index | 43 | <50 = clean |
How does South Twin Lake compare?
South Twin Lake's grade of A matches or beats the Minnesota state average of C. It ranks #3 of 16 lakes in Mahnomen County by water quality score.