How Clean Is Lake Mendota?
Lake Mendota is nutrient-rich, with elevated phosphorus and algae. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 5 ft. Phosphorus: 65.4 µg/L. Trophic State Index: 59.
Cleanliness Snapshot
| Metric | Lake Mendota | Wisconsin avg |
|---|---|---|
| Water Clarity (Secchi) | 5 ft | — |
| Phosphorus | 65.4 µg/L | <30 = clean |
| Trophic State Index | 59 | <50 = clean |
How does Lake Mendota compare?
Lake Mendota's readings run above the Wisconsin state average. It ranks #9 of 15 lakes in Dane County by water quality score. Multi-year monitoring data shows water quality is declining based on 7 years of records.
Watch Lake Mendota water quality
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