Mississippi River Bridge and I-70 Interchange Finished South View

Mississippi River Bridge and I-70 Interchange Aerial

Mississippi River Bridge and I-70 Interchange

Practical Design Achievement on New St. Louis Gateway

Mississippi River Bridge and I-70 Interchange and Corridor

Missouri Department of Transportation (MoDOT) | St. Louis, MO

The new Interstate 70 interchange is a critical component of the New Mississippi River Bridge (MRB or the “Stan Span”) project that creates a new gateway between Illinois and Missouri and provides better connections to and through St. Louis. The new interchange also provides a new gateway into the downtown area opening up opportunities for economic revitalization. Crawford, Murphy & Tilly (CMT) was the lead firm on the design of the $31 million construction cost project.

The Missouri Department of Transportation (MoDOT) had high expectations for this project, requiring a cost-efficient design that would improve safety and meet the needs of the region. CMT met and exceeded MoDOT’s goals by utilizing innovative methods to reduce construction costs, while still maintaining the project’s intent and providing a high quality design. Unique methods were incorporated into the design process, such as an innovative and streamlined one-day Practical Design Workshop, attended by 20 experts from various civil engineering fields, who helped identify over 80 ideas, resulting in significant highway and bridge cost savings (28% or nearly $13 million).

The award winning and high-profile project involved extensive stakeholder and agency coordination on both sides of the River, including a successful FHWA and IDOT plan that rerouted Interstates 70 and 44. A consolidated project office (with the client and other project design teams) enabled CMT’s team to successfully complete an aggressive design schedule (10 months faster than a typical one).

Our diversity initiatives on the project included a mentor-protege’ approach resulting in a high level of meaningful participation by minority and other disadvantaged firms. This success contributed to CMT being named the 2013 Consultant of the Year by MoDOT’s Diversity Division.

The CMT St. Louis staff produced quality work at a very reasonable cost in a very timely manner. Their responsiveness was impeccable. It was clear that their client’s satisfaction was their driving factor. My 30 years of experience in this business has led me to believe that this is a testament to the leadership of the organization. Thank you for a job well done.

Greg Horn, PE

Project Director, Missouri Department of Transportation (MoDOT)

Project Contact(s)

Kevin Fuller, PE

Project Award(s)

  • Three top awards as part of overall "I-70 Mississippi River Bridge and Corridor" where CMT and three other consultants (HNTB, AECOM, US Services) submitted jointly.
  • American Council of Engineering Companies - Missouri, Grand Award 2014
  • American Council of Engineering Companies, National Recognition Award 2015
  • American Council of Engineering Companies - Illinois, Eminent Conceptor Award 2015
  • American Council of Engineering Companies - Missouri, Grand Conceptor Award 2015

Project Service(s)

  • Design and Construction Engineering
  • Feasibility Studies
  • Interchange Justification
  • Lighting Design
  • Planning
  • Practical Design
  • Public Involvement Coordination
  • Roadway Design
  • Signalization Design
  • Stormwater Utilities
  • Structural Engineering
  • Sustainable Design
  • Traffic Studies, Management and Design
  • Utility Coordination
  • Value Engineering