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Toxic Legacy: Century-old tar plumes under Lake Superior stir health fears — and a cleanup could be years away

Credit: Kate Golden
Wisconsin Center for Investigative Journalism

Want to know more about “conditionally closed” and other terms here? Here’s a link to DNR’s glossary. And to learn more about any particular site, search for it in this state database of contaminated sites.

The nonprofit Wisconsin Center for Investigative Journalism ( collaborates with Wisconsin Public Radio, Wisconsin Public Television, other news media and the UW-Madison School of Journalism and Mass Communication. All works created, published, posted or disseminated by the Center do not necessarily reflect the views or opinions of UW-Madison or any of its affiliates.

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Kate Golden, multimedia director and reporter, specializes in environmental stories and data visualizations.