Construction has begun on the Olive and Lindbergh interchange reconfiguration project to turn the existing cloverleaf interchange into a folded diamond interchange, which will move commuter traffic more efficiently and offer full connectivity for cars, bikes, and pedestrians. The two cloverleaf ramps on the south side of Olive are scheduled to be closed for construction and will re-open Spring, 2022. This project is funded by $4 million of federal transportation funding to design and construct the new interchange, a $1 million match from St. Louis County Transportation and $250,000 of funding from the City of Creve Coeur.
The Olive and Lindbergh interchange reconfiguration is one of the significant transformative projects planned to implement the bold vision of the 39 North Innovation District, a 600-acre global hub for plant and life sciences located in Creve Coeur.
The main vehicular interchange moving over 62,000 cars a day throughout the St. Louis Region is at the intersection of Olive and Lindbergh Boulevards. This cloverleaf interchange does not accommodate all traffic movements. Traffic movements from westbound Olive to northbound Lindbergh and from southbound Lindbergh to westbound Olive must use the old Olive Street Road connections and make their turns well in advance of the interchange location.
The 39N Master plan recommended that the existing interchange be reconfigured into a fold diamond design to eliminate the circular ramps on the north side of the interchange and serve all movements of traffic. The folded diamond reconfiguration of the interchange would create significant positive impacts for the region’s commuter system and throughout the 39N district. Coupled with the Old Olive Street Road redesign into a “Great Street” offering full connectivity for cars, bikes, and people, the new folded diamond interchange design will more efficiently move commuter traffic and eliminate a barrier for people wishing to easily access the amenities in the 39N district.
Another benefit of the new Olive/Lindbergh interchange redesign is that it will free up property, formerly used for right of way, that could be used in the future for economic development.
The St. Louis Economic Development Partnership hired Access Engineering (now TREKK Engineering) to design the intersection and RV Wagner to construct the intersection. MODOT owns both roads and will operate the new intersection once it is complete.