- I-470/U.S. 50 Interchange
Our team provided preliminary and final design of improvements to the interchange between I-470 and U.S. 50 in Lee’s Summit, Missouri. Initial planning efforts entailed conceptual design of ultimate future improvements to the existing cloverleaf interchange to replace two of the loop ramps with high-capacity directional ramps. Improvements included a new split-diamond interchange, widening of I-470, collector-distributor roads between Pryor Road and Blue Parkway, four new bridges and one bridge widening.
We were responsible for final design of the widening of 1.2 miles of mainline interstate for a continuous auxiliary lane between U.S. 50 and the next adjacent interchange to the east, Douglas Avenue. The widening expanded the existing bridge over a Union Pacific Railroad mainline track, which required coordination to assure minimum vertical clearances. The road and bridge widening were constructed under traffic. The firm was also responsible for design of water and sanitary sewer relocations within the project limits.
The team provided structural design services for eight bridges and several large retaining walls for this complex four-level interchange. Challenging span layouts to accommodate future interchange expansion were a critical element in the design. The bridge design included two horizontally curved 1200-foot viaduct structures over Route 50 and two horizontally curved 1,500-foot flyover structures over I-470.
This project implemented practical design initiatives that saved nearly $7 million on the split-diamond interchange, keeping the budget at $45 million for the entire interchange. The project team worked closely with the Missouri Department of Transportation, the City of Lee’s Summit and a private developer to keep the project on track and on schedule.
- Roadway design
- Value engineering
- Bridge design
- Environmental permitting
- Geotechnical investigation
- Federal Aid MoDOT LPA
- Multiuse trail on Pryor Road bridge