Sustainably Speaking: Wisconsin DNR provides an update on Little Lake Butte des Morts

WINNEBAGO CO., Wis. (WFRV)- Little Lake Butte Des Morts in Winnebago County recently received positive news in the waterways recovery from the PCB cleanup that took place in the early 2000s.

Polychlorinated biphenyls, or PCBs, are a man-made chemical that was used often in the 20th century to make carbonless copy paper. In the late 1970s, the federal government banned the usage of PCBs due to their impact on human health and wildlife.

The cleanup of the Fox River started in 2004, beginning with Little Lake Butte Des Morts, and ended in 2020 at the mouth of the Fox River at the southern end of the Bay of Green Bay. Jim Killian was involved in the PCB cleanup and is a sediment and dredge material management coordinator with the Wisconsin DNR.

“Here in Little Lake Butte des Morts, which was the first stage of the clean up of the entire 29 miles of the Fox River PCB project, hydraulic dredges were used to remove three hundred and seventy thousand cubic yards of contaminated sediment,” says Killian. “That’s roughly the equivalent of thirty thousand dump trucks full of wet mud.”

On top of removing the PCBS from the area, Killian says 114 acres of the river bed were capped with layers of sand and gravel to prevent the PCBs from entering the water column beneath the river. With that part of the project in the rearview mirror, the Wisconsin DNR announced the lake has been placed in a monitored recovery stage.

Rae Ann Eifert is the Lake Michigan monitoring and sediment coordinator for the Wisconsin DNR and is in charge of the long-term monitoring of the lake. Eifert explains what is in the plans as part of the monitoring stage.

“Essentially that means they go out every five years to check to see the progress toward their final goals in terms of fish tissue concentrations for PCBs and then PCB concentrations in the water.”

The last water sampling took place in 2022, and the results of that round resulted in the lake being elevated to this monitoring stage. The next round will take place in 2027 and Eifert says this will be another stepping stone to the goal of a ninety percent reduction in the PCBs in the water.

“Everything is continuing to come down and it does seem like we are going to meet our goals in terms of making sure the fish are safer to eat and that environmental exposure to PCBs has really decreased in this area. “

However, humans are more at risk of being exposed to PCBs through the consumption of fish that inhabit the waterway. Eifert explains that anglers planning to consume the fish should still be on high alert.

“PCBs don’t like to be soluble, they like to be hydrophobic so they like to bind to particles,” explains Eifert. “So your primary way of being exposed to it is not through the actual water itself, it’s through your actual consumption of fish.”

Fish advisories on the amount of consumption do continue for Little Lake Butte des Morts and many lakes and rivers across the state. Eifert says the advisories vary by fish and can vary by gender and age.

The DNR reminds anglers to check for any postage signage at the boat launch of the lake or river. If there is no signage, use this application on the DNR website to find out the advisories at the waterway that you are headed out to.

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