> Projects > I-29/I-480/West Broadway Interchange

I-29/I-480/West Broadway System Interchange

West Broadway Interchange
Learn more: I-29/I-480/West Broadway Interchange construction begins soon!


Project Location

Council Bluffs, IA


The I-29/I-480/West Broadway System Interchange project will address capacity needs, improve safety, and correct functional design issues at this location and at adjacent interchanges 41st Street, North 35th Street, Avenue G and 9th Avenue. Project benefits:

  • Provides direct access to West Broadway from I-29 via one-way frontage roads
  • Efficient and safe vehicle movement on I-480 and I-29
  • Reduced motorist lane changes

The I-29/I-480/West Broadway System Interchange project includes the area of I-29 north of the Union Pacific Railroad Bridge to a point just west of North 25th Street along with the I-480 corridor to the Iowa side of the Missouri River crossing. A final preferred alternative was selected in July 2017 (See Final EA, July 2017), which provides direct access to West Broadway from I-29 via one-way frontage roads. Iowa DOT is in the process of obtaining right of way for the construction project and drafting final design of this interchange. Construction is anticipated to begin in spring 2021.

An interim project was completed in 2016/2017 to improve access to Playland Park and River’s Edge development area north of the I-480 interchange. This project extended Benson Street from Avenue D to Avenue B along with pavement marking channelization at the existing 40th Street interchange with I-480. The project provides localized operational improvements and alternate accessibility during future construction.


Environmental Study (includes Environmental Surveys): 06/2015 – 11/2017
Interim Project: 2016/2017
Preliminary Design: 01/2017 – 12/2017
Right of Way Acquisition: 2018 – 2020
Final Design: 01/2018 – 06/2020
Anticipated Construction: 04/2021 – 08/2024

NEW! Alternate I-29 Frontage Road System

Project Map
Project Map


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Project Name: I-29/I-480/West Broadway System Interchange
Project Number(s):Grade & Pave IMN-029-3(169)54--0E-78; Traffic Signs IM-029-3(218)53--13-78; Traffic Signals IM-029-3(219)53--13-78; Lighting IM-029-3(220)53--13-78; Bridge IM-029-3(70)53--13-78; Bridge IM-029-3(71)53--13-78; Bridge IM-029-3(73)53--13-78; Bridge IM-029-3(74)53--13-78; Grade & Pave IM-NHS-029-3(190)53--03-78; Bridge IM-NHS-029-3(192)54--03-78; Bridge IM-NHS-029-3(193)54--03-78; Bridge IM-NHS-029-3(221)54--03-78; Bridge IM-NHS-029-3(222)54--03-78; Bridge IM-NHS-480-1(166)0--03-78; Bridge IM-NHS-480-1(167)0--03-78


Alternate I-29 Frontage Road System – November 2, 2021
Public Hearing for the Segment 4 Tier II Environmental Analysis – August 15, 2017
Public Hearing Segment 4-Preferred Concept I-29/I-480 Interchange – August 15, 2017
Final EA, Published July 2017
Preliminary Concept 1
Preliminary Concept 2
Interim Project
Environmental Studies
Design Overview
2016 Pre-Construction Season Public Meeting – March 24, 2016
Property Acquisition