How Clean Is Madison Lake?
Madison Lake is nutrient-rich, with elevated phosphorus and algae. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 4 ft. Phosphorus: 75 µg/L. Chlorophyll-a (algae): 27.8 µg/L. Trophic State Index: 62.
Cleanliness Snapshot
| Metric | Madison Lake | Minnesota avg |
|---|---|---|
| Water Clarity (Secchi) | 4 ft | — |
| Phosphorus | 75 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 27.8 µg/L | <10 = clean |
| Trophic State Index | 62 | <50 = clean |
How does Madison Lake compare?
Madison Lake's readings run above the Minnesota state average. It ranks #2 of 5 lakes in Blue Earth County on nutrient and algae readings. Multi-year monitoring data shows water quality is improving based on 5 years of records.
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