How Clean Is Ossawinnamakee Lake?
Ossawinnamakee 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): 20 ft. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 1.8 µg/L. Trophic State Index: 35.
Cleanliness Snapshot
| Metric | Ossawinnamakee Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 20 ft | — |
| Phosphorus | 9 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 1.8 µg/L | <10 = clean |
| Trophic State Index | 35 | <50 = clean |
How does Ossawinnamakee Lake compare?
Ossawinnamakee Lake's grade of A matches or beats the Minnesota state average of C. It ranks #11 of 85 lakes in Crow Wing County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.
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