How Clean Is Cottonwood Lake?
Cottonwood Lake is algae-prone, with a higher bloom risk in warm months. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 1.8 ft. Phosphorus: 154.5 µg/L. Chlorophyll-a (algae): 64.5 µg/L. Trophic State Index: 72.
Cleanliness Snapshot
| Metric | Cottonwood Lake | Minnesota avg |
|---|---|---|
| Water Clarity (Secchi) | 1.8 ft | — |
| Phosphorus | 154.5 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 64.5 µg/L | <10 = clean |
| Trophic State Index | 72 | <50 = clean |
How does Cottonwood Lake compare?
Cottonwood Lake's readings run above the Minnesota state average. It ranks #2 of 2 lakes in Lyon County on nutrient and algae readings.
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