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. The Improve 70 Alliance (Emery Sapp & Sons, Clarkson Construction, HNTB, and Bartlett and West) has been selected as the apparent best-value proposer and design-build contractor and construction began in 2025 with an anticipated completion in late 2028.
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
Project Goals:
- Deliver the project within the program budget.
- Provide an additional lane of travel in each direction on I-70 from Warrenton to I-64 and on I-64 from I-70 to Route K.
- Improve the I-70/I-64/US 61 interchange to provide for better traffic flow and safety.
- Modernize I-70 while improving the existing pavement, bridges, and interchanges to enhance mobility, including freight.
- Minimize construction impacts with a focus on work zone safety, communication and construction staging while maintaining mobility.
- Complete project by Dec. 1, 2028, utilizing a diverse workforce.
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 close Route Z under Interstate 70 in Wentzville starting June 6
ST. CHARLES COUNTY – The Missouri Department of Transportation will close Route Z under Interstate 70 in Wentzville as part of the Improve I-70 Warrenton to Wentzville Project starting Friday, June 6. All work is weather permitting.
Route Z will be...
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MoDOT to close one lane on eastbound I-64 entrance ramp from Route K starting June 2
ST. CHARLES COUNTY – The Missouri Department of Transportation will close one eastbound Interstate 64 entrance ramp lane from Route K as part of the Improve I-70 Warrenton to Wentzville Project starting Monday, June 2. All work is weather permitting...
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MoDOT to begin Route 61 work at Interstate 70 in Wentzville starting May 29
ST. CHARLES COUNTY – The Missouri Department of Transportation will begin construction of a new auxiliary lane on Route 61 near the Interstate 70/Interstate 64 interchange in Wentzville as part of the Improve I-70 Warrenton to Wentzville Project...
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MoDOT to close right lane of eastbound Interstate 70 at Wentzville Parkway starting May 27
ST. CHARLES COUNTY – The Missouri Department of Transportation will close the right lane of eastbound Interstate 70 between Wentzville Parkway and Route Z as part of the Improve I-70 Warrenton to Wentzville Project starting Tuesday, May 27. All work...
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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...
STAY INFORMED
Sign Up For Project/Construction Press Releases
To receive specific project updates and construction related press releases, sign up for Improve I-70 e-mails by visiting MoDOT e-Update and selecting one or more of the Improve I-70 options under the Improve I-70 heading. If you already have an e-Update account, you can login and adjust your e-mail preferences.
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
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