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Great Lakes Environmental Research Laboratory

satellite map of Michigan, the Great Lakes
National Oceanic and Atmospheric Administration (NOAA)

The Great Lakes go up and down. It's just a fact of life. 

Water levels in Lakes Superior, Michigan and Huron continue to be above their monthly averages for the first time in 16 years.

NOAA.gov

Scientists are working to identify a cyanobacteria bloom near the Maumee River. It's a yearly event that occurs during the warm summer months.

Researchers at the Great Lakes Environmental Research Laboratory confirmed that the cyanobacteria bloom has been intensifying over the last week.

Also known as blue-green algae, it can be harmful to the aquatic environment and to people. People shouldn't swim in a bloom- it can cause skin rashes or even severe stomach problems.

Tim Davis is a research biologist with the lab.