Ribbon-cutting marks completion of new I-270 bridges over Mississippi River

ST. LOUIS, Mo. (First Alert 4) - A ribbon-cutting ceremony was held on Monday for the new Interstate 270 Chain of Rocks twin bridges crossing the Mississippi River.

Construction of the bridges was overseen by IDOT, with the $496.2 million cost shared between Illinois and Missouri. The groundbreaking for the project was in 2023, with the eastbound span opening in late 2024.

Now, the westbound bridge is anticipated to open on Monday, Nov. 16.

“Illinois is the gateway to the world — representing one of the most important commerce hubs in the country. Whether it’s workers making their commute or delivery drivers moving freight, Illinoisans deserve a safe and reliable system to get where they need to go,” said Illinois Governor JB Pritzker. “With the completion of the I-270 Mississippi River Bridge, we are creating better-paying jobs, expanding access to regional travel and spurring economic growth for communities across the state.”

Once open, the bridges will initially have two lanes of traffic in each direction over the river.

The project will be finalized with median work, guardrail installation, and painting of girders and beams next construction season, after which three lanes will be open in each direction.