I-270 North Design-Build

North St. Louis County, Missouri

Missouri Department of Transportation

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Delivery:

Design-Build

Engineer:

Parsons Transportation Group

Awards:

"AGCMO Keystone Project of The Year, Mid-America Class, Highway & Transportation ACEC/MO Engineering Excellence Award - Grand Award DBIA Meaningful Diversity, Equity & Inclusion (DEI) Engagement DBIA National Award of Merit in Transportation (other than Aviation) ITE 2024 Transportation Achievement Award - Traffic Engineering MOVITE 2024 Transportation Achievement Award - Traffic Engineering APWA 2024 Project of the Year (>$75M) AGC 2022 Diversity & Inclusion Excellence Award Winner (Mid-Sized Contractor) MoDOT Value Engineering Award"

Services:

  • Highway Construction
  • Concrete Flatwork
  • Bridge Construction
  • Soundwalls
  • Earthwork/Grading

Details:

  1. New interchanges at North Lindbergh, Hanley/Graham, New Florissant, Washington/Elizabeth, West Florissant, New Halls Ferry, Old Halls Ferry, and Route 367.
  2. Additional driving lane in both directions on I-270 from North Lindbergh to Route 367
  3. Improved accessibility for bicyclists and pedestrians with a multi-use path from Lindbergh to Breezy Point along Dunn, and from Hanley/Graham to Old Halls Ferry along Pershall
  4. Improved accessibility to transit with new counterflow bus-only lane and improved access to bus stops throughout the corridor.
  5. Improved safety with an updated outer road system that includes removal of all cross over slip ramps. The I-270 North Design Build project was completed in December of 2023 and was delivered on time and on budget.

Project Details

I-270 is one of the heaviest traveled interstates in Missouri and a route of local, regional, and national significance carrying over 140,000 vehicles per day, 18% of which are heavy trucks. Buit in the 1960s, the corridor serves as a primary freight route for commercial vehicle traffic around St. Louis and is designated on both National Highway Freight and Strategic Highway Networks. In 2019 MoDOT began procurement for the I-270 North Design-Build Project and selected Millstone Weber and their Designer, Parsons Transportation to: reconstruct and rehabilitate deteriorated pavement; reconstruct or rehabilitate bridges; improve traffic operations, geometrics, and safety; improve accessibility along and across the corridor for transit, bicycles, and pedestrians; and make improvements to the interchanges and outer roads of the I-270 North corridor. The resulting I-270 North Design-Build Project has improved safety and reliability within the I-270 corridor, better connected communities, and enhanced traffic operations. The I-270 North Design Build project has eliminated all crossover slip ramps on the outer roads through a one-way outer road system, mitigated bottlenecks on the freeway through widening and innovative interchange designs, and enhanced pedestrian and bike facilities. The North St. Louis Community is heavily reliant on multi-modal travel, and our team prioritized the enhancement of pedestrian walking and biking trails along with expanded transit operation accommodations. A critical part of the project was the construction of a new 10-mile multi-use path along Dunn Road between Lindbergh Boulevard and Breezy Point and along Pershall Road between Hanley/Graham Road and Old Halls Ferry Road. This new multi-use path provides pedestrian and bicycle connection between communities throughout the entire project area. Project highlights include:

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