Boone County Route 740
The intersection of Stadium (Rte 740) and I-70 was a heavily congested interchange that handled the main traffic volume for Columbia’s largest commercial district. Emery Sapp & Sons were awarded the project to rehabilitate the interchange into a Diverging Diamond as well as improve and widen the entire corridor for roughly a mile south through the business district. The interchange was required to remain open for the entire extent of the project, with exception to a single weekend closure to perform the traffic switch. The widening was performed on I-70 EB & WB, all four ramps, and the south outer roads to prep for the new DDI format. Moving south along Stadium, major storm sewer renovations were installed through heavily laden utility corridor. An extra lane was added in each direction along Stadium from Broadway to I-70. Intersection improvement and service street widening/improvements were added to Broadway, Ash, Worley, and Bernadette. All four service street intersections, the DDI, and the Stadium corridor were upgraded to be ADA accessible throughout. All business entrances within the project limits were upgraded as well.
The DDI was completed and traffic was switched into the final configuration over a month ahead of schedule. The remaining section between the DDI and Broadway including side street improvements was opened to all lanes of traffic, more than five months ahead of schedule.
Owner Missouri Highway and Transportation Commission
Civil Engineer CFS Engineers
ESS Role General Contractor
Project Duration 21 months
Scope of Work
The project featured converting Columbia’s second busiest intersections from a standard diamond interchange into a Diverging Diamond Interchange (DDI), as well as new drainage, curb & gutter, street widening, and intersection improvements along Rte 740 (Stadium Blvd) from the north outer roads to 700′ south of Broadway. Key elements of the project included: grading, concrete paving, major storm sewer relocation, curb and gutter, business entrance rehabilitation, intersection widening, extensive ADA improvements, as well as all-new intersection signals and detection systems. The project was a combination bid of three separately designed projects lumped under a single contract. The project was funded through a joint collaboration between MoDOT, City of Columbia, and a local Transportation Development District.