Counties Impacted
St. Louis
In Progress

Southwest St. Louis County area construction 2021

I-44 bridge replacement – This project replaces the eastbound and westbound I-44 bridges just west of I-270 over the Meramec. Update ramps between southbound I-270 and westbound I-44. Constructs shared use path and connections to existing trailways.  Work continues through early 2022.

I-55 pavement repairs  –  Makes pavement repairs between Route 67 (Lindbergh Boulevard) and the city limits. Work should be complete by late summer 2021.

I-64 crack sealing  – Work is between Route 340 (Olive Boulevard) and Ballas Road. Should be complete by late summer 2021.

I-270 crack sealing  – Work is between I-64 and Route 364 (Page Avenue). Should be complete by late summer 2021.

Route 30 signal replacements – Updates the signals at Sappington/Denny, Route P, Elgin, and Seibert. Project should be complete by late 2021.

Route 100 roadway improvements  –  This project updates signals and drainage between Lindbergh and Big Bend, and upgrades sidewalks to meet Americans with Disabilities Act requirements in that area.  This project replaces the bridge at Black Creek and modifies the Deer Creek bridge. Includes city of Brentwood tunnel work at Mary Avenue. When the work is complete, the roadway will be resurfaced. Work starts in late summer 2021.

Route 340 interchange improvement  –  This project, overseen by St. Louis County, updates the Route 67 (Lindbergh Boulevard) and Route 340 (Olive Boulevard) interchange to a folded diamond, and constructs an overpass at Old Olive Street Road. Work should be complete by late 2023. 

Route 340 road widening – This project widens a portion of Route 340 between Spoede Road and Old Olive for left turn lanes.