How Clean Is Big Mcdonald Lake?
Big Mcdonald Lake is among the cleanest lakes in Minnesota. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 17.4 ft. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 3.2 µg/L. Trophic State Index: 39.
Cleanliness Snapshot
| Metric | Big Mcdonald Lake | Minnesota avg |
|---|---|---|
| Water Clarity (Secchi) | 17.4 ft | — |
| Phosphorus | 12 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 3.2 µg/L | <10 = clean |
| Trophic State Index | 39 | <50 = clean |
How does Big Mcdonald Lake compare?
Big Mcdonald Lake's readings match or beat the Minnesota state average. It ranks #13 of 66 lakes in Otter Tail County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.
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