MoDOT to narrow lanes on Interstate 70 at the Cave Springs and Zumbehl interchanges

ST. CHARLES COUNTY – Drivers traveling in both directions of Interstate 70 at the Cave Springs and Zumbehl interchanges may be delayed starting Monday, June 27, weather permitting. Crews will begin reducing the interstate lanes and adding barrier wall between the median and shoulders underneath each interchange.

One lane in each direction will be closed Monday through Friday from 7 p.m. to 5 a.m. as crews will install barrier walls and temporary striping. Lanes will be reduced from the standard 12-foot lanes to temporary 11-foot lanes.

The reduction in lane widths will remain in place on I-70 through mid-2023.

This work is part of reconstructing the Cave Springs and Zumbehl interchanges as single point urban interchanges (SPUI) for the I-70 Cave Springs to Fairgrounds Design-Build Project. When work on the interchange bridges begins, both interchanges will remain open to drivers.

This Design-Build project is a partnership with St. Charles County, who has contributed $10 million of the $62 million cost of the reconstruction.

This project allows for potential future expansion of Interstate 70, which currently remains unfunded.

This section of I-70 was built in the 1950s and 1960s, making it one of the oldest sections of interstate in the country and one of the busiest in Missouri.

For more information, visit for project updates.



Districts Involved
St. Louis