How Clean Is South Long Lake?
South Long 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): 9 ft. Phosphorus: 24 µg/L. Chlorophyll-a (algae): 8.8 µg/L. Trophic State Index: 49.
Cleanliness Snapshot
| Metric | South Long Lake | Minnesota avg |
|---|---|---|
| Water Clarity (Secchi) | 9 ft | — |
| Phosphorus | 24 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 8.8 µg/L | <10 = clean |
| Trophic State Index | 49 | <50 = clean |
How does South Long Lake compare?
South Long Lake's readings match or beat the Minnesota state average. It ranks #75 of 85 lakes in Crow Wing County by water quality score. Multi-year monitoring data shows water quality is stable based on 6 years of records.
Watch South Long Lake water quality
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