How Clean Is Grand Lake?
Grand Lake has fair water quality — typical of lakes with moderate nutrient enrichment. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 8 ft. Phosphorus: 27 µg/L. Chlorophyll-a (algae): 8.5 µg/L. Trophic State Index: 50.
Cleanliness Snapshot
| Metric | Grand Lake | Minnesota avg |
|---|---|---|
| Water Clarity (Secchi) | 8 ft | — |
| Phosphorus | 27 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 8.5 µg/L | <10 = clean |
| Trophic State Index | 50 | <50 = clean |
How does Grand Lake compare?
Grand Lake's readings match or beat the Minnesota state average. It ranks #12 of 32 lakes in Stearns County by water quality score. Multi-year monitoring data shows water quality is stable based on 6 years of records.
Watch Grand Lake water quality
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