How Clean Is Preston Lake?
Preston 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): 5 ft. Phosphorus: 222 µg/L. Chlorophyll-a (algae): 39.2 µg/L. Trophic State Index: 68.
Cleanliness Snapshot
| Metric | Preston Lake | Minnesota avg |
|---|---|---|
| Water Clarity (Secchi) | 5 ft | — |
| Phosphorus | 222 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 39.2 µg/L | <10 = clean |
| Trophic State Index | 68 | <50 = clean |
How does Preston Lake compare?
Preston Lake's readings run above the Minnesota state average. It ranks #2 of 2 lakes in Renville County on nutrient and algae readings. Multi-year monitoring data shows water quality is improving based on 6 years of records.
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