Is Madison Lake Safe for Swimming?
Madison Lake in Blue Earth County, Minnesota has nutrient and algae measurements on record from state and federal monitoring. Chlorophyll-a in the monitoring record runs high enough that algae is a factor. A water-quality reading is not a swimming clearance. The state water agency and county health departments post current advisories; check them before you swim.. Water clarity: 4 ft visibility. Phosphorus: 75 µg/L. Chlorophyll-a (algae): 27.8 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Water Clarity (Secchi Depth) | 4 ft |
| Phosphorus | 75 μg/L |
| Chlorophyll-a (Algae) | 27.8 μg/L |
| Maximum Depth | 59 ft |
| Location | Blue Earth County, Minnesota |
How does Madison Lake compare?
With an overall water-quality readings of —, Madison Lake runs above the Minnesota state average. It ranks #2 of 5 lakes in Blue Earth County by water quality score.
Water clarity (Secchi depth) sits at 4 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 27.8 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.
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