Des Peres Road Roundabout

Project Summary

In 2017, the City of Des Peres utilized a MoDOT TEAP grant (Traffic Engineering Assistance Program) to study traffic on Des Peres Road. One of the recommendations of the study was reconfiguration of the intersection of Des Peres Road with Old Des Peres Road. This intersection was the site of frequent accidents due to its unique nature. While many laypeople suggested a four-way stop, the volume during peak periods would cause significant delays and backups. The study suggested either a traffic signal or roundabout. Given the geometry and setting of the location, a roundabout was deemed the better option.

The City applied for a CMAQ grant (Congestion Mitigation & Air Quality) in May 2018 through the East-West Gateway Council of Governments, but was unsuccessful. Over the 2018-2019 winter, the City designed and implemented minor modifications to the intersection to reduce accidents. We are happy to report that over the past year, rear-end collisions have been reduced by this modification. However, right-angle collisions persist. The City again applied for a CMAQ grant in 2019, and the the grant was approved, providing 80% reimbursement for all phases of the project: Design 2020, ROW 2021, Construction 2022. The total project budget is approximately $1.6M.

Project Update and Schedule

Due to the size of the project, MoDOT’s Qualification-Based Selection process must be strictly followed in choosing an engineer for design. A Request for Qualifications (RFQ) was posted with MoDOT in November 2019, with responses due 12/11/19. Letters of interest were received from eight (8) consultants, then reviewed in order to select the best-qualified firm, in accordance with state and federal law. Three finalists were interviewed in January by staff in order to further evaluate their qualifications. CMT was selected, and their contract was approved by the Board of Aldermen 3/23. Design work will soon commence and continue through 2021. Any necessary easements or rights-of-way (ROW) will be acquired in 2021, and construction will take place in 2022.

Updated 3/25/20