How Clean Is Sullivan Lake?
Sullivan 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): 10.8 ft. Phosphorus: 14 µg/L. Trophic State Index: 43.
Cleanliness Snapshot
| Metric | Sullivan Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 10.8 ft | — |
| Phosphorus | 14 µg/L | <30 = clean |
| Trophic State Index | 43 | <50 = clean |
How does Sullivan Lake compare?
Sullivan Lake's grade of A matches or beats the Minnesota state average of C. It ranks #4 of 16 lakes in Morrison County by water quality score. Multi-year monitoring data shows water quality is declining based on 4 years of records.