I-55 Corridor Improvements Conceptual Study in Jefferson County

The Missouri Department of Transportation’s (MoDOT) St. Louis District, in conjunction with the Federal Highway Administration, is conducting a conceptual study along Interstate 55, from the Route Z interchange to the Route 67 interchange in Jefferson County. The I-55 Corridor Improvements project area includes the cities of Pevely, Herculaneum, Festus, and Crystal City.

This initial phase allows MoDOT to understand the current corridor conditions and identify what improvements could be considered and implemented. The conceptual study will look at the existing safety, design standards, geometry, traffic congestion, bridge conditions, and utilities in the corridor. It will also consider local coordination, and future changes and growth in the area. In future phases, MoDOT will lead the project team through environmental clearance and preliminary design, final design, and construction.

For more information, download the I-55 Corridor Improvements Fact Sheet

Counties Impacted
Project Status
Planning Phase
Route Impacted
Interstate 55

Phase 1 Conceptual Study Timeline

In Progress
Analyze Existing Conditions

Summer - Fall 2021

Public Information Meeting #1
Virtual Meeting on Sept. 22, 2021


Not Started
Develop Recommended Alternatives

Fall 2021 - Winter 2022

Not Started
Public Information Meeting #2

Winter 2022

Not Started
Complete Conceptual Study Report

Winter - Spring 2022


Two public meetings were held on Wednesday, Sept. 22, 2021 where the project team  introduced the project, presented the corridor’s existing conditions and received motorists feedback on current problems along the corridor.  If you were not able to join the virtual public meeting, a recording of it is below for your viewing.  

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Who to Contact

Contact Photo
Photo of Jennifer Becker
Jennifer Becker
Project Manager
St. Louis District
Contact Info

Office:  (314) 453-5099
E-mail: Jennifer.Becker@modot.mo.gov

Contact Photo
Stephen O'Connor Profile Picture
Stephen O'Connor
Area Engineer, Franklin and Jefferson Counties
St. Louis District
Contact Info

Office: (314) 453-5021
E-mail: Stephen.OConnor@modot.mo.gov