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LakeQuality

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: 10 µg/L. Trophic State Index: 36.

Cleanliness Snapshot

MetricOssawinnamakee LakeMinnesota avg
Overall GradeAC
Water Clarity (Secchi)20 ft
Phosphorus10 µg/L<30 = clean
Trophic State Index36<50 = clean

How does Ossawinnamakee Lake compare?

Ossawinnamakee Lake's grade of A matches or beats the Minnesota state average of C. It ranks #5 of 120 lakes in Crow Wing County by water quality score. Multi-year monitoring data shows water quality is declining based on 5 years of records.