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.  Consequently, the Missouri Department of Transportation (MODOT) owns and maintains both Old Olive Street Road East and West as a state highway ramp connection.

The 39N Master plan recommends 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.

$4M of Federal transportation funding was secured to design and construct the new interchange with a $1M match from St. Louis County Transportation and $300,000 from the City of Creve Coeur.  The design is underway and will be bid for construction in 2020.  The new interchange should be operational in early 2021.