Projects

I-70 And Fifth Street Interchange Improvements

I-70 And Fifth Street Interchange Improvements

CBB is a member of the team that conceptualized and designed improvements at the Fifth Street, Convention Center Boulevard, and I-70 Interchange in St. Charles County, MO. The interchange provides access to many of the region’s attractions including Historic Main Street St. Charles, St. Charles Convention Center, and the Family Arena, as well as a host of local businesses, shops, restaurants, hotels, and employment centers. Nearly one-half of the traffic crossing the Blanchette Bridge enters on exits at I-70 at Fifth Street and First Capitol Drive, and this area is one of the busiest segments of I-70 in Missouri.  The I-70 Fifth Street Interchange Improvements Project has improved access and traffic flow and is stimulating economic development at this busy interchange.
The project constructed a Diverging Diamond Interchange at Fifth Street, added new ramps to Fairgrounds Road, and connected the two interchanges with one-way outer roads. I-70 was widened to four lanes in each direction under the First Capitol Drive overpass to increase capacity and reduce weaving on I-70. The project filled in gaps in the local sidewalk system by building new sidewalks along Fifth Street, Veterans Memorial Parkway, and Fairgrounds Road. New bike lanes were added to the Fairgrounds Road overpass.
CBB participated in the development of initial conceptual layouts and completed the operational performance evaluations with HCM, SYNCHRO, SIDRA, and VISSIM traffic flow models. We conducted safety studies using Highway Safety Manual methodologies and were responsible for the project’s Access Justification Report (AJR). We assisted St. Charles County in completing the projects Congestion Mitigation and Air Quality (CMAQ) federal funding application, which contributed to funding for the project’s construction. During the design phase we served as the chief designer for all signing, striping, lighting, traffic signals and Intelligent Transportation Systems (ITS). Construction was completed in 2017.

Photo courtesy of Missouri Department of Transportation https://www.flickr.com/photos/modot/

Projects

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CBB 
12400 Olive Boulevard, Suite 430
St. Louis, MO 63141
314-878-6644
314-878-5876 (fax)