"This isn't just an investment for the Metro East region — it's an investment for our entire nation. This major freight corridor connects our ports and railways — essential to maintaining a steady supply chain for Illinoisans, Missourians, and all Americans alike," Pritzker said. "Up and down the Metro East region, we're restoring and rebuilding, creating good-paying jobs, and making sure working families have the opportunities and resources they need to build good lives for themselves."
"The I-270 Chain of Rocks Bridge is transformative. We are witnessing how our investments in infrastructure are helping our communities provide commercial and transportation support while keeping us all connected," said Lt. Governor Juliana Stratton. "This bridge is a vital transportation asset between [the] Metro East and greater St. Louis region, and as the Chair of the Rivers of Illinois Coordinating Council, I am proud to be here today and see what can happen when we work together as one. This new development is an indicator that Illinois is working towards the future of all of our residents while putting our region at the forefront in transportation."
The I-270 loop connects many of the region's warehouses and distribution parks, ports, airports, and rail yards on both sides of the Mississippi River. Nearly 70% of the region's industrial tenants occupying large warehouse space in excess of 500,000 square feet are within 10 minutes of the interstate.
Built in 1966, the existing bridge over the river is two lanes in each direction with narrow, one-foot shoulders that pose safety concerns for vehicle breakdowns and first responders. The bridge accommodates 51,000 vehicles a day, about 20% of which are trucks, and the structure requires frequent maintenance and repairs due to its age.
A $496.2 million joint IDOT-MoDOT project will replace the bridge with two structures that have wider shoulders that can accommodate the eventual expansion of I-270 to three lanes in each direction. A companion $35.4 million MoDOT project will reconstruct the Riverview Drive interchange just west of the bridge.
"The I-270 Chain of Rocks bridge represents the great partnership between Missouri and Illinois investing in this vital freight corridor connecting I-270 to I-70," said Missouri Governor Mike Parson. "Along with the bridge, Missouri is transforming I-270 as well as making historic improvements to I-70 across the entire state. ... Infrastructure has remained a top priority for us since the very beginning. We've come a long way in Missouri, and as witnessed with this project and countless others, we are not done yet."
Construction started last winter and is anticipated to wrap up in 2026.
"It's incredibly important we maintain and improve our state's infrastructure. The Chain of Rocks Bridge plays a critical role in connecting those coming to and from the Metro East and Greater St. Louis Area," said Senator Erica Harriss (R-Glen Carbon). "As traffic counts have more than doubled since the construction of the current bridges, there is a critical need to replace the bridges and improve the overall safety for both passenger and commercial traffic."
"Thanks to Gov. Pritzker's vision and the support of the General Assembly in passing Rebuild Illinois, transformational projects are completed or underway in every part of the state," said Illinois Transportation Secretary Omer Osman. "The I-270 project is extra special because of the partnership with Missouri to work together to improve safety, commerce, and quality of life for an entire region."
Both Missouri and Illinois continue to coordinate on long-term plans to improve capacity and increase reliability of I-270 by adding a third lane in each direction, extending as far east as Illinois 157. In IDOT's current multiyear improvement program, $75 million is identified courtesy of Rebuild Illinois for an additional lane between the river and just east of St. Thomas Road, a project that includes the reconstruction of the Illinois 3 interchange.