Project Summary
MoDOT, in coordination with the Federal Highway Administration, is finishing the re-evaluation process to update the Environmental Impact Statement (EIS) of Interstate 70 (I-70) in Warren and St. Charles counties. As work to update the Environmental Impact Statement wraps up, Improve I-70 Warrenton to Wentzville has transitioned to a Design-Build project.
This contract requirements included the following improvements:
- Add a third lane of travel to eastbound and westbound I-70 between Warrenton and Wentzville.
- Interchange and outer road improvements in Wright City.
- Realignment at the railroad bridge on I-70 between Wentzville Parkway and Route Z.
- Interchange improvements at I-70 and I-64/Route 61.
- Add a third lane of travel to eastbound and westbound I-64 between I-70 and Route K.
- Bridge replacement in Foristell.
The Warrenton to Wentzville project includes the Improve I-70 and additional legislatively designated General Revenue funding. It also includes previously allocated funds in the state’s program for other I-70 and I-64 projects for a total contract cost of $600 million.
Since its original construction more than 50 years ago, I-70 has been a vital lifeline for moving people, goods, and information across Missouri and beyond.
Warrenton to Wentzville Video Gallery
Best Value Proposer Selection
The Missouri Highways and Transportation Commission has the Improve 70 Alliance (Emery Sapp & Sons, Clarkson Construction, HNTB, and Bartlett and West) as the apparent best-value proposer and design-build contractor of Improve I-70: Warrenton to Wentzville. Negotiations to finalize the contract are currently in progress. Construction is scheduled to begin in spring 2025 with an anticipated completion in late 2028.
MoDOT plans to host additional public information meetings in early 2025 ahead of construction where project plans and traffic control details for the project will be shared. To learn more about the Design-Build delivery process, click here.
This overview is also available as a PDF: Download PDF
Proposal Highlights
The selected team, Improve 70 Alliance, was one of three shortlisted Design-Build teams. The winning proposal highlights engineering and design endeavors set out before the teams and an understanding of the local, statewide, and national importance of an improved I-70. The winning proposal includes:
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Constructing a third lane in each direction on I-70 from Warrenton to I-64 in Wentzville, including replacing the existing I-70 lanes with new full-depth concrete pavement.
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Interchange improvements at I-70 and the I-64/Route 61 interchange.
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Interchange and outer road improvements in Foristell, Wright City, Warrenton, and at Route Z.
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Realignment at the railroad bridge on I-70 between Wentzville Parkway and Route Z.
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Addition of a third lane of travel to eastbound and westbound I-64 between I-70 and Route K.
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The team has also committed to keeping two lanes of travel open on I-70 in both directions during peak travel times.
Project Renderings
Proposed design renderings of Improve I-70 Warrenton to Wentzville. More renderings and information are available now on the Plans and Displays page.
Proposed design renderings of Improve I-70 Warrenton to Wentzville. More renderings and information are available now on the Plans and Displays page.
Project News Releases
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MoDOT to narrow eastbound I-70 lanes between Warrenton and Foristell
WARREN COUNTY – The Missouri Department of Transportation will begin narrowing eastbound Interstate 70 lanes in two locations between Warrenton and Foristell as part of the Improve I-70 Warrenton to Wentzville Project. All work is weather permitting...
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MoDOT to close one lane on eastbound I-70 between Warrenton and Foristell overnight starting April 6
WARREN COUNTY – The Missouri Department of Transportation will close one eastbound Interstate 70 lane from the Route MM/Warrenton Boulevard interchange to the St. Charles County line as part of the Improve I-70 Warrenton to Wentzville Project...
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MoDOT Celebrates Second Improve I-70 Project Groundbreaking
ST. LOUIS – The groundbreaking of the second project within the Missouri Department of Transportation’s Improve I-70 Program kicked off with an official ceremony today, March 20, in Foristell. MoDOT, joined by state and local elected officials, along...
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MoDOT to close lanes on I-70 and I-64 as part of Improve I-70 Warrenton to Wentzville project
ST. CHARLES COUNTY – The Missouri Department of Transportation will close the right lane on eastbound Interstate 70 from west of Wentzville Parkway to Route Z for tree clearing connected to the Improve I-70 Warrenton to Wentzville Project starting...
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REMINDER: Public hearings scheduled for second Improve I-70 project from Warrenton to Wentzville
JEFFERSON CITY – The public is invited to public hearings regarding the Improve I-70: Warrenton to Wentzville project from 5 p.m. to 7 p.m. on Monday, Feb. 3, in Warrenton, and from 5 p.m. to 7 p.m. on Thursday, Feb. 6, in Wentzville. This is the...
Improve I-70: Warrenton to Wentzville Milestones
Tuesday, Aug. 29, 4 to 6 p.m. – Warren County Administration Building, 101 Mockingbird Lane, Warrenton, MO
MoDOT invited the public to attend informational meetings to learn about the proposed plan and next steps for I-70. These were open house style meetings, and no formal presentations will be made. The public could attend the meetings anytime during the advertised hours, and the information will be the same at each location. MoDOT is currently in the planning stage of the Improve I-70 Program. MoDOT engineers shared preliminary information about the goals for improving I-70, possible construction schedules for the 200 miles, and next steps. Learn more here.
Banquet Hall in Progress Park (968 Meyer Rd. Wentzville, MO 63385)
For industry access to information such as the sign in sheet and presentation from the industry meeting, please email improvei70@modot.mo.gov and request access to Improve I-70: Warrenton to Wentzville's industry Sharepoint site.
Conference Center at Midwest Genealogy Center (3440 S. Lee's Summit Road, Independence, MO 64055)
For industry access to information such as the sign in sheet and presentation from the industry meeting, please email improvei70@modot.mo.gov and request access to Improve I-70: Warrenton to Wentzville's industry Sharepoint site.
An Industry Meeting is scheduled for June 4, 2024 at 1:00 p.m. at Holt High School, 600 Campus Drive, Wentzville, MO. For industry access to information such as the sign in sheet and presentation from the industry meeting, please email improvei70@modot.mo.gov and request access to Improve I-70: Warrenton to Wentzville's industry Sharepoint site.
The pre-qualified teams are as follows:
- Ames Millstone Weber Joint Venture
- Ames Construction, Millstone Weber, Parsons Transportation Group
- Ames Construction, Millstone Weber, Parsons Transportation Group
- Improve 70 Alliance Joint Venture
- Emery Sapp & Sons, Clarkson Construction, HNTB, Bartlett & West
- Emery Sapp & Sons, Clarkson Construction, HNTB, Bartlett & West
- The Walsh Design-Build Team
- Walsh Construction, American Structurepoint, RS&H, Olsson
There are still opportunities for additional consultants and subcontracting firms to be added to each team.
Progress Park Center, 968 Meyer Rd. Wentzville, MO
This contract was awarded to the Improve 70 Alliance Joint Venture team.
- WARRENTON: Monday, Feb. 3, 2025, 5 p.m. to 7 p.m. at the Warrenton High School Commons Area located at 803 Pinckney St. Warrenton, MO 63383.
- WENTZVILLE: Thursday, Feb. 6, 2025, 5 p.m. to 7 p.m. at the Progress Park Recreation Center located at 968 Meyer Rd. Wentzville, MO 63385.
MoDOT and its Design-Build contract team, alongside other federal, state, and local leaders, hosted a formal groundbreaking ceremony for Improve I-70: Warrenton to Wentzville at 10 a.m. on Thursday, March 20, 2025 at the closed eastbound I-70 weigh station in Foristell.
What is Design-Build?
Design-build is a delivery method that includes hiring one contracting team to complete the design work and build the highway improvement under one contract. MoDOT provides the project goals, budget and schedule and the contractor team completes the work. This technique has been known to significantly save time and provide cost savings.
Project Contacts
Kim Trainor, P.E.
Title
Improve I-70: East Project Team Director
Department
Central Office
Contact Info
(573) 231-2786
(573) 231-2786
Christopher Kelly
Title
Improve I-70: East Project Team Deputy Director
Department
Central Office
Contact Info
(314) 453-5034
(314) 453-5034
Eric Kopinski
Title
Improve I-70 Program Director
Department
Central Office
Contact Info
Lairyn McGregor
Title
Improve I-70 Communications Coordinator
Department
Central Office
Contact Info
Phone: 816-607-2152
Email: Lairyn.McGregor@modot.mo.gov
Phone: 816-607-2152
Email: Lairyn.McGregor@modot.mo.gov