Great Lakes Water Levels

Muck Makes Appearance on Saginaw Bay – Upper Thumb Beaches Open

We received our first reports of significant algae muck making its seasonal appearance on Saginaw Bay this week. The rotting algae were spotted near the Nayanquing Point State Wildlife area on the western edge of Saginaw Bay. Northeast winds pushed the algae mats to shore over the past several days.

Lake Muck on Shore
Nayanquing Point State Wildlife Area

According to Dan O’Keefe at the Michigan State University Extension, this stinky nuisance is caused as a byproduct of the invasive zebra and quagga mussels. The mussels consume phytoplankton from the lake, effectively filtering out the bay. This results in pristine water clarity, which allows sunlight to reach the bottom of the lake. The green algae Spirogyra and Cladophora grow exponentially with this sunlight. The green algae then die off and rise to the surface, creating Saginaw Bay muck mats which accumulate onshore.

The muck smell has been compared to manure, which is not far off. In our post, Great Lakes Pollution – Saginaw Bay Muck Is Poop; we found that the muck is the carrier host for pathogens like E.coli and Salmonella.

Lake Muck on Beach
Muck on the Beach

In 2012, a Michigan State University Department of Fisheries and Wildlife research assistant, Marc Werhougstraete said “Muck means sewage and fecal matter are likely evident.” This is caused by old and failing septic tanks, overflow wastewater from Saginaw and Bay City, and runoff from rain-soaked fields sprayed with manure waste from Concentrated Animal Feeding Operations, (CAFOs).

Huron County Beaches Are Open

On the east side of Saginaw Bay, the water quality remains high. The Huron County Health Department tests water quality from all its county beaches, looking for E.coli concentrations. Over the past eight weeks only one closure occurred. Caseville County Park, was shut down briefly in June for high E. coli levels. So far, in July, all beaches tested OK and remain open.

Cautions On Cleaning Muck From Your Beach

If you see the matted Great Lakes muck on the beach, think “poop.” Here is some advice on dealing with it.

  • Don’t go into the water, and don’t let your kids play in the wet sand.
  • Please avoid contact with muck, wash hands when in contact with it.
  • Do not submerge your head in the water.
  • Be careful when cleaning the muck. Raking also can release the pathogens from the muck—clean in when no one is around. A sunny day can kill bacteria.

Related Saginaw Bay Muck Reading

Great Lakes Restoration Initiative EPA Advisory Board

Algae Bloom in Michigan’s Saginaw Bay Seen from Space

2020 Great Lakes Water Levels – July

The Big Views of Fish Point Wildlife Area


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