How Clean Is Big Round Lake?
Big Round 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): 5 ft. Phosphorus: 27 µg/L. Chlorophyll-a (algae): 6.9 µg/L. Trophic State Index: 52.
Cleanliness Snapshot
| Metric | Big Round Lake | Wisconsin avg |
|---|---|---|
| Water Clarity (Secchi) | 5 ft | — |
| Phosphorus | 27 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 6.9 µg/L | <10 = clean |
| Trophic State Index | 52 | <50 = clean |
How does Big Round Lake compare?
Big Round Lake's readings run above the Wisconsin state average. It ranks #28 of 55 lakes in Polk County on nutrient and algae readings. Multi-year monitoring data shows water quality is improving based on 7 years of records.
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