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
Public Hearings - February 2025
Public hearings for Improve I-70: Warrenton to Wentzville will be held in Warrenton and in Wentzville where project plans, construction phasing, and schedule will be shared. These will be open house style meetings. No formal presentations will be made. The public may come anytime during the advertised hours and the information will be the same at each location. Written and oral recorded comments will be accepted. All public meeting materials and an online comment form will be available on the project website beginning on Feb. 3 until March 6.
- 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.
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 will be available at the public information meetings tentatively scheduled for early 2025.
Proposed design renderings of Improve I-70 Warrenton to Wentzville. More renderings and information will be available at the public information meetings tentatively scheduled for early 2025.
Construction Segments and Schedule
Interchange Improvements
- I-70 and I-64/U.S. Route 61 Interchange (Plans)
- Wentzville Bottleneck / Norfolk Southern Railroad Bridge (Plans)
- I-70 Interchange at T/W in Foristell (Rendering)
- I-70 Interchange at T/W in Foristell (Plans)
- I-70 at Route 47 in Warrenton (Rendering)
- I-70 at Route 47 in Warrenton (Plans)
- I-70 at F/J/Elm in Wright City (Rendering)
- I-70 at F/J/Elm in Wright City (Plans)
Roll Plot Displays for I-70
Display shows roadway plans for I-70 between mile markers 191 and 192. For the full size image visit https://www.modot.org/media/50684 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 192 and 193. For the full size image with zoom in capability visit https://www.modot.org/media/50688 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 193 and 195. For the full size image with zoom in capability visit: https://www.modot.org/media/50691 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 195 and 196. For the full size image with zoom in capability visit https://www.modot.org/media/50694 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 196 and 197. For the full size image with zoom in capability visit https://www.modot.org/media/50696 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 197 and 198. For the full size image with zoom in capabbility visit https://www.modot.org/media/50698 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 198 and 199. . For the full size image with zoom in capability visit:. For the full size image with zoom in capability visit: https://www.modot.org/media/50700 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 199 and 201. For the full size image with zoom in capability visit: https://www.modot.org/media/50702 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 201 and 202. For the full size image with zoom in capability visit: https://www.modot.org/media/50704 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 202 and 203. For the full size image with zoom in capability visit https://www.modot.org/media/50706 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 203 and 204. For the full size image with zoom in capability visit: https://www.modot.org/media/50708 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 204 and 206. For the full size image with zoom in capability visit: https://www.modot.org/media/50710 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 206 and 207. . For the full size image with zoom in capability visit: https://www.modot.org/media/50712 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 207 and 208. For the full size image with zoom in capability visit: https://www.modot.org/media/50714 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 208 and 209. For the full size image with zoom in capability visit: https://www.modot.org/media/50716 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 209 and 211. For the full size image with zoom in capability visit: https://www.modot.org/media/50718 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 at mile marker 210 and U.S. Route 61. For the full size image with zoom in capability visit https://www.modot.org/media/50720 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for I-70 between mile markers 211 and 212. For the full size image with zoom in capability visit https://www.modot.org/media/50722 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Roll Plot Displays for I-64
Display shows roadway plans for additional lane of I-64 at log mile 1. See the full size display with zoom in ability here: https://www.modot.org/media/50667 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for additional lane of I-64 at log miles 1 through 3. See the full size image with zoom in ability here: https://www.modot.org/media/50668 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov
Display shows roadway plans for an additional lane on I-64 between log miles 3 and 4. See the full size image with zoom in ability here: https://www.modot.org/media/50672 For more accessibility options, contact us at improvei70east@modot.mo.gov
Photo shows roadway plans for additional lane on I-64 between log miles 4 and 6. See the full size image with zoom in ability here: https://www.modot.org/media/50675 For more accessibility assistance, contact us at improvei70east@modot.mo.gov.
Display shows roadways plans for an additional lane at I-64 between logmiles 6 through 7. For the full size image with zoom in ability visit: https://www.modot.org/media/50677 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov.
Display shows roadways plans for an additional lane of I-64 between logmiles 7 through 9. For the full size image with zoom in ability visit: https://www.modot.org/media/50679 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov.
Display shows roadway plans for an additional lane on I-64 between log miles 9 and 10. For the full size image with zoom in ability, visit: https://www.modot.org/media/50681 For more accessibility assistance, please contact us at improvei70east@modot.mo.gov.
Public Hearing Comment Period (February 3 - March 6, 2025)
MoDOT will host two in-person public hearings regarding Improve I-70: Warrenton to Wentzville on both February 3 in Warrenton, and on Thursday, Feb. 6 in Wentzville. Written and oral comments and questions will be accepted at these meetings. In addition to the in-person meetings, those interested can review the meeting materials on this webpage and submit their comments and questions in the form below between February 3 and March 6, 2025.
Project News Releases
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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...
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Public hearings scheduled for second Improve I-70 construction 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...
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Contractor selected for the Improve I-70 project: Warrenton to Wentzville
ST. LOUIS – The Missouri Highways and Transportation Commission (MHTC) has selected Improve 70 Alliance Joint Venture as the apparent best-value proposer and Design-Build contractor of the next project in MoDOT’s Improve I-70 Program. The joint...
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Temporary traffic impacts in Wright City for soil boring as part of Improve I-70 Project #2
Hannibal – The Missouri Department of Transportation will close lanes on eastbound North Service Road and westbound Veterans Memorial Parkway in Wright City, Warren County for soil boring investigation for the Improve I-70 Project #2. All work is...
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MoDOT Announces Prequalified Teams for Second Improve I-70 Project
JEFFERSON CITY – The Missouri Department of Transportation has received Statements of Qualifications (SOQs) from teams interested in competing for the contract to design and construct the second project of MoDOT’s statewide Improve I-70 Program...
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.
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.