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The I-435 corridor was originally constructed in 1966 as a six-lane freeway and an additional lane was added in phases from 1983 to 1994. Improvements have been made over the past 20 years by both Kansas Department of Transportation (KDOT) and MoDOT but this corridor has been left virtually unchanged. This segment of freeway provides an important link between residents and jobs on the south side of the metropolitan area. Increased corridor maintenance expenditures, safety problems and traffic congestion have led MoDOT to develop a transportation master plan for this segment of interstate.

Project Status: Radmacher-Wilson Team Wins the Competition
for MoDOT's I-435 Corridor Project in South Kansas City

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Radmacher-Wilson Team Wins the Competition for MoDOT's I-435 Corridor Project in South Kansas City

On Dec. 1, 2017, the Missouri Highways & Transportation Commission announced that the Radmacher-Wilson Team -- construction contractor Radmacher Brothers Excavating Inc. and the engineering design firm of Wilson & Company, Inc. -- won the competition for the Design-Build project known as the I-435 South Loop Link. Work is anticipated to begin in spring of 2018 and be fully completed by late spring 2020. 

 “We’re thrilled to work with both Radmacher Brothers and Wilson & Company on this project,” said Kansas City District Engineer Brian Kidwell. “We’ve worked with both of them independently on projects throughout the district. We expect great things from this collaboration.”

With a budget of $75 million, the department bundled multi-bridge replacements, resurfacing and corridor safety and mobility improvements from the Kansas state line to the Three Trails Crossing interchange into a Design-Build project delivery format. Interested teams competed to provide innovative, goal-driven, results-oriented transportation solutions within a fixed budget. 

Three Teams Short-Listed for I-435 South Loop Link Project

KANSAS CITY – The Missouri Department of Transportation (MoDOT) has evaluated, rated and short-listed three teams from whom it received Statements of Qualification (SOQ) to compete for the contract to design and build improvements to Interstate 435 from the Kansas state line to Interstate 49.

“We are very pleased that the I-435 South Loop Link Project will proceed with these qualified teams,” said Project Director Perry Allen. “We look forward to working through the procurement process in the coming months to select the best team to deliver this important regional improvement.”

The short-listed teams are as follows:

Clarkson Construction/Burns & McDonnell joint venture

Steve Kellerman 816.718.6930

Radmacher Bros. Excavating/Wilson & Co.

Ed Andres 816.215.8353

Ideker/Millstone Weber joint venture

HDR Engineers

Paul Ideker 816.261.8214


The study limits are from State Line Road to Grandview Road in Jackson County. The study area includes the local service interchanges of State Line Road, Wornall Road, Holmes Road and 104th Street. The study area also includes the arterial roadway network north and south of the I-435 freeway corridor. The study builds on work previously performed by MoDOT and will culminate in a master plan for this section of I-435.

I-435 South Corridor Study

 The purpose of this study is to evaluate what types of improvements are needed in this section of the I-435 corridor to provide a safe and efficient transportation corridor for all modes.

Average Daily Traffic

I-435 has the highest traffic volume of any MoDOT facility in Kansas City and the second highest traffic volume in the metropolitan area.

Bridge Assessment

This report documents  existing bridge plans and inspection reports by MoDOT. The site was visited on May 14, 2014 to develop an initial assessment of the condition of the bridges.


Upon review of the widening needed, it became apparent that an additional three-foot width would accommodate most of the complementary strategies including managed lanes, hard shoulder running and bus on shoulder. Any of the optional alternatives could be accommodated if the through lanes were narrowed to a minimum of 11 feet. Additionally, widening the base typical section three feet would provide for a normal left shoulder width of 10 feet, which would address a concern that FHWA has expressed concerning the median shoulder width where three or more lanes are present.

Other complementary strategies of bicycle/pedestrian improvements, ramp metering enhancements, roadside motorist assist and crash investigation sites, traffic signal coordination, alternative route improvements and other Intelligent Transportation System and Integrated Corridor Management solutions are also part of the preferred concept.


Aerial View


Groundbreaking Ceremony


As part of construction on this project, MoDOT will impact the Blue River Greenway Trail for a short period of time. To keep bike and pedestrian traffic flowing, MoDOT is considering a defined detour along one of the lanes of 104th Street. We are currently accepting comments on this portion of the project. Click here to submit your comments or add your name to an
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