great-lakes-space

Algae Bloom in Michigan’s Saginaw Bay Seen from Space


From NASA

This post was originally published in 2012. It’s one of the most viewed and searched for on ThumbWind until our Michigan Wind Farm Map was issued. With the recent budget cuts announced for the EPA by the current administration it’s feared that the Great Lakes and Saginaw Bay will once again experience muck and fecal encrusted beaches.

The once pristine waters of Michigan’s Saginaw Bay now look like Lake Erie in the 1960’s. This observation was made by oceanographers with the National Oceanic and Atmospheric Administration, NOAA, after reviewing images made by the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Aqua satellite on October 9, 2011.

Researchers were comparing algae blooms in Lake Erie and Saginaw Bay. “This is considered the worst bloom in decades,” says Richard Stumpf of NOAA. The green in Saginaw Bay is probably an algal bloom as well.” According to NASA, over the past decade Microcystis, a type of blue-green algae known to produce the toxin microcystin, has returned to the Great Lakes. No single cause has been pinpointed, but runoff from cities, fertilizers, septic tank overflow, zebra mussels, and livestock near water supplies are likely culprits.

Saginaw River a Significant Source

Despite $45 million in improvements, Bay City and Saginaw wastewater treatment overflow millions of gallons with partially treated waste water into Saginaw River which flows into the Bay. Laura Ogar, the Bay County Director of Environmental Affairs and Community Development notes that reports are made averaging six overflows a year. Published reports estimated that 90 million gallons of overflow occurred in 2011. Bacteria still present in the water without full treatment.


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