Counties Impacted
St. Louis
Project Status
In Progress

Southwest St. Louis County area construction 2019


I-44 – Safety improvements. Installs selected safety improvements to reduce the likelihood of wrong way drivers at various interstate ramps on I-44 between the city limits and the Franklin County line.

I-44 – Bridge replacement.  This project replaces the eastbound and westbound I-44 bridges just west of I-270 over the Meramec. Replaces the bridges on the ramps between I-44 and eastbound Watson Road.  Work has begun on the project, which continues through early 2022. 

I-44 – Bridge rehabilitations. Makes repairs to the bridges at Osage Street, Viaduct, and Route OO, Six Flags, BNSF and UP railroad and Route 109 and 1st Street. Also includes work on the I-44 Loop Road bridge at Fox Creek. Work begins in late spring 2020.

I-44 business loop  – Pavement improvements. Resurfaces the I-44 business loop from Neosho Street to just east of Allenton Road.

I-55 – Pavement improvements. This project repairs pavement and updates guardrail between Lindbergh and Route 141. Work begins in spring 2020.

Route 30—Signal replacement. Updates the signals at Sappington, Route P, Elgin, Weber and Seibert.  Work begins in spring 2020.

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. When the work is complete, the roadway will be resurfaced. Work starts in fall 2020.

Route 109 – Bridge rehabilitation.  Crews will remove and replace the deck of the bridge, widen the bridge over Route 100 to four lanes, and construct a two-lane roundabout at the ramps and at Route 109 and Main Street.  Crews will also construct an underpass to take the Wildwood shared use path under Route 109. Major impacts to traffic are complete in winter 2019, but work will continue through spring 2020.

Route 231 – Pavement improvements – This project resurfaces Route 231 between Franru and the St. Louis city limits.

Route AB – Bridge replacement  –  Replace the bridge over Hibler Creek. Work will require closing Ladue during construction between Memorial Day and Labor Day 2020. Work begins in spring 2020.