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Chicago’s sewer and deep tunnel system couldn’t handle this weekend’s rain, allowing untreated sewage and stormwater into Lake Michigan.

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A hefty Bighead carp, one of several types of Asian carp, caught in a net near Morris, Illinois. (Evan Garcia / Chicago Tonight)

A plan to fortify a barrier against Asian carp was set to be released in February but has been stalled by the Trump administration. 

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(Smart Destinations / Flickr)

As more cruises and kayaks join commercial barges on the river, some tour boat operators are concerned about safety. Learn the “rules of the road” for Chicago waterways.

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A silver carp was captured Thursday in the Illinois Waterway below the T.J. O’Brien Lock and Dam, about 9 miles from Lake Michigan. (Courtesy of Illinois Department of Natural Resources)

An 8-pound Asian carp was discovered last week beyond an electric barrier designed to prevent the invasive fish from reaching Lake Michigan. 

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Officials in Whiting, Indiana, think their city is about to become a whole lot more popular.

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(Flickr / Eric Allix Rogers)

Same-day water testing conducted at UIC's School of Public Health will give Chicagoans more timely alerts about water quality at their favorite beaches this summer. 

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A view of the Great Lakes from space. (USEPA Environmental-Protection-Agency / Flickr)

Issues impacting the Great Lakes and communities surrounding the massive freshwater system will be at the center of a two-day conference in Chicago starting Wednesday.

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(U.S. Fish and Wildlife Service)

With nearly $300 million in federal funding on the chopping block, leaders from across the Great Lakes region will convene next month in Chicago to address lead poisoning, oil pipelines and other threats to the area’s waters.

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Indiana Dunes

A spill last week at a U.S. Steel site in Northwest Indiana released an unknown amount of a potentially carcinogenic chemical into a Lake Michigan tributary, prompting the closure of three beaches at Indiana Dunes National Lakeshore.

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(Evan Garcia / Chicago Tonight)

Looking at the impact of a proposed funding cut to the program that aims to keep invasive species out of the Great Lakes.

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(Frank McNamara / Flickr)

Lake Michigan and other Great Lakes could see a substantial amount of federal funding dry up.

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In the depths of a Chicago winter – and especially when there's a winter heat wave – sometimes you just have to get outside. But what if you’re not one for skiing or skating? We decided to go fish.

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(Roman Boed / Flickr)

Geoffrey Baer dives into the history of Chicago’s water and answers viewer questions about ghostly paper images haunting a South Side neighborhood and memories of a space-themed park.

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Despite a spate of recent reports, the Illinois Department of Natural Resources says that reintroducing alligator gar into Illinois' waterways will not prevent Asian carp from reaching Lake Michigan.

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(Roman Boed / Flickr)

Proposed legislation could open the door to more invasive species in the Great Lakes, say environmentalists. But shippers say it puts a patchwork quilt of conflicting regulations under one federal agency that allows them to do business while still keeping invasive species out.

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This bighead carp was caught in the Illinois River, the principal tributary of the Mississippi River. There are no North American fish large enough to eat Asian carp, according to the Asian Carp Regional Coordinating Committee. (USGS)

A process similar to making soda water may be an effective strategy in warding off an Asian carp invasion that’s threatening the health of the Great Lakes, including Lake Michigan.