Fish species diversity has been increasing in the Chicago River. (Shedd Aquarium)

Back in the 1980s, the number of fish species found in the Chicago River could be counted on a single hand. Today, that number is up to 60 species, an increase in diversity that can be directly attributed to a decrease in wastewater pollutants, according to a new study from the Shedd Aquarium.

Chicago River tour boats are reflected by a building window in Chicago, Wednesday, Sept. 1, 2021. (AP Photo / Nam Y. Huh)

Rowers, kayakers and other users of the Chicago River are getting a real-time look at one measure of water quality in the system that weaves through downtown and several neighborhoods. 

Lake Michigan waves cover Chicago’s lakefront path in the summer of 2019. (WTTW News)

Because Chicago is situated in the middle of the country it would, at first glance, appear to be insulated from the worst effects of climate change. But a much-talked about report from environmental journalist Dan Egan pours cold water on that myth. He joins us with details.

A boat carries two- and four-legged passengers along the Chicago River on Wednesday, July 7, 2021. (WTTW News)

ComEd treated some hard-working members of its team to the ride of their lives as a way to educate the public about the utility company’s use of goats to manage overgrown vegetation around hard-to-reach power lines.

The American mink is equally at home on land or in the water. And despite its size, is not to be trifled with. (Jan Den Ouden / Pixabay)

The American mink is the poster critter for Chicago River Day, the annual cleanup hosted by Friends of the Chicago River that has volunteers fanning out from Lake County to Calumet to clear litter and trash from sites along the waterway. Here’s how to participate in Saturday’s event.

(Richard Schneider / Flickr)

Riverwalk bars, restaurants and other recreational vendors will open on a rolling schedule throughout the coming weeks, starting Friday with full service expected by the end of May, city officials said.

An aerial picture shot with a drone shows the Chicago River as it flows through downtown after it was dyed green in celebration of St. Patrick’s Day. (Scott Olson / Getty Images)

Even with the second straight year of no parades in honor of the Irish inspired holiday, at least one Chicago tradition broke through.

A proposed rendering of a renovated Morton Salt building. (Credit: Chicago Department of Planning and Development)

The metamorphosis of the land along the North Branch of the Chicago River from an industrial powerhouse into Chicago’s newest community area is poised to take another giant step forward at Wednesday’s full City Council meeting.

Headwaters of Bubbly Creek and the Racine Avenue Pump Station. (Courtesy of USGS)

Congress authorized a plan from the Army Corps of Engineers to restore the Chicago River’s South Fork, a 1.25-mile stretch more familiarly known as Bubbly Creek. Now actual dollars need to follow. 

A group of suckers on the move in Door County, Wisconsin. (Courtesy of Shedd Aquarium)

Walking along Lake Michigan or the Chicago River, it’s difficult to imagine an underwater world teeming with life. But it’s there, promises Karen Murchie, a research biologist at the Shedd Aquarium, and we have to protect it.

A section of the MWRD's Deep Tunnel. (Metropolitan Water Reclamation District of Greater Chicago / Facebook)

An upcoming virtual tour will offer insights into the Metropolitan Water Reclamation District’s inner workings and will revisit the reversal of the Chicago River. 

Floating habitat being positioned on the Chicago River. (Shedd Aquarium / Brenna Hernandez)

Rafts loaded with plants floated down the Chicago River last week, a strange sight that in decades past might have been the result of some sort of bizarre garbage spill but these days is a sure sign of the waterway’s ongoing “re-wilding.”

A flooded Riverwalk along the Chicago River. (WTTW News)

This spring, Chicago saw record rainfall for the third May in a row – and with it, the return of flooded streets, parks and basements. A new analysis finds many more Chicago properties are at risk of flooding than previously thought.

Chicago River stormwater diversion tunnel at work, with water flowing from the outtake. (Patty Wetli / WTTW News)

Early Monday morning, the North Branch Chicago River gauge at Pulaski Road showed the waterway at 17.87 feet, inches away from the river's "minor" flood level at 18 feet, according to National Weather Service data.

The DuSable Bridge (Marcin Wichary / Flickr)

The bridge, which spans the Chicago River at Michigan Avenue, paved the way for development of Chicago’s Magnificent Mile. Tune in at 7 p.m. Thursday to celebrate its past and present.

Individual litter cleanup efforts will have to replace the Chicago River Day group event this year due to the coronavirus. (Courtesy Friends of the Chicago River)

The organization had to cancel its Chicago River Day cleanup due to the coronavirus. Instead of bringing thousands of volunteers together for a one-day event, the new Summer Challenge encourages people to pick up litter in their neighborhoods.