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

Analyze Existing Conditions
Summer - Fall 2021
Public Information Meeting #1
Virtual Meeting on Sept. 22, 2021

A recording of the meeting is below.

Public Information Meeting #2
Virtual Meetings on Jan. 19 & 20

A recording of the meeting is below.

In Progress
Develop Recommended Alternatives
Winter 2022
Not Started
Complete Conceptual Study Report
Spring 2022



Virtual public meetings were held on Wednesday Jan. 19 and Thursday, Jan. 20.  The project team presented two conceptual design alternatives and obtained feedback.  In case you missed it, a recording of the meeting is below. 

An abbreviated public meeting display is available at the Festus Public Library until Thursday, Jan. 27.  The public is invited to review the information boards during the library's open hours and provide comments on the comment form which will be available on-site, or you may complete the form by clicking the link at right.  

Festus Public Library
400 West Main Street
Festus, MO 63028

Monday-Thursday 9 a.m.-7 p.m.
Friday 9 a.m.-5 p.m.
Saturday 9 a.m.-2 p.m.


Public feedback is important to the I-55 Conceptual Study team as MoDOT assess the two conceptual design alternatives. There are three ways to share your input: 

  • Complete an on-line comment form
    Click on the link above-right to complete the comment form. The form will be available until Tuesday, Feb. 2. 
  • Fill out a paper comment form
    Paper copies of the public comment form will be available at the information display at the Festus Public Library, 400 West Main Street, Festus, MO from January 20-27.
  • Send your comments to Project Manager Jenn Becker via mail, email, or voicemail
    Missouri Department of Transportation, Attn: Jenn Becker
    7 Village Square Dr.
    Hazelwood, MO 63042

All comments must be submitted by Tuesday, Feb. 2.


Two public information 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 virtual public information meeting #1, a recording of it is below for your viewing.  

January 2022 Virtual Public Meeting
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September 2021 Virtual Public Meeting
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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