“Lake Michigan does not have the fuel, the nutrient concentrations that Muskegon Lake has. Once that bloom is out there, it’s probably going to spread a little bit,” Ruck said.

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Touching water impacted by algal blooms can be dangerous to people and animals. People who spot blooms in Cayuga Lake are asked to file a report.

And now we’re seeing that it might be moving out into Lake Michigan as well.” While not all algal blooms are dangerous, testing found harmful cyanotoxins in the blooms in Muskegon Lake.