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I-5 Over 26th Avenue Improvements

Design Phase

Region 1: Portland metro and Hood River County (Portland, Multnomah)

​​​​​This project will improve the I-5 crossing over SW 26th Ave in Southwest Portland with a new structure.


Construction Impacts

​We expect to start construction in early 2023 and finish in summer 2024, though the schedule is subject to change. 

Interstate 5 impacts
  • Beginning in 2023, occasional nighttime lane closures and possible nighttime one-direction closures on I-5.
  • In 2024, I-5 will close in both directions for one full weekend from Friday night to Monday morning. During these closures there will be a regional detour using I-205 and some signed local detours. Travelers can expect congestion and delays.

SW 26th Avenue impacts
  • Beginning in 2023, SW 26th Avenue will be fully closed to motor vehicles directly under I-5 for about a year. Businesses on SW Barbur Court and homes on SW 26th Avenue will still be accessible.
People walking, biking and rolling will have access under I-5 for almost all of the project. We’re still exploring how to keep people moving through the area during brief times when we’ll need to completely close SW 26th Avenue directly under I-5. We’ll share more information closer to construction. 

We are limiting nighttime work to only 90 nights so that project noise is less disruptive to the surrounding neighborhood. During those nights neighbors may hear construction noise. We will use construction practices that mitigate noise, and we will have a 24/7 noise hotline for neighbors to call during construction.

Meetings and Events

​Project online open house: open now

Visit our online open house to learn more about the project background and what to expect during construction.


2022: Design 

Spring 2023: Construction starts—SW 26th Avenue closed to motor vehicles for a year.

Spring/Summer 2024: Full closure of I-5 in both directions for one weekend (Friday evening through Monday morning). Dates to be announced. 



Project Overview and Background

ODOT is getting ready to improve Interstate 5 over SW 26th Avenue in Portland to ensure its continued reliability for travelers. We will replace the current bridge with a new, improved structure and upgrade SW 26th Avenue with better lighting, bike lanes and sidewalks.

The I-5 bridge over Southwest 26th Avenue was built in 1959 and widened in the 1980s. It carries over 100,000 vehicles per day. Its deck is heavily worn and near the end of its useful life. The project will maintain this important freeway connection and create a smoother ride for travelers while bringing it up to current seismic standards using an innovating construction method that also saves time and money.

Construction will happen in 2023 and 2024. Most traffic impacts will occur under I-5 on local streets, but there will be a weekend full closure of I-5 in 2024. We are working closely with the Portland Bureau of Transportation (PBOT) for the portion of the project on SW 26th Avenue.

Project Area Map

Project area at I-5 over SW 26th Avenue in SW Portland.

Bridge Replacement

Using an innovative method, we will construct a new structure underneath the existing bridge. We will then remove the current bridge and replace it with asphalt paving during one weekend I-5 full closure in both directions.

We chose this option because it means lower costs, shorter construction time, fewer traffic impacts, less nighttime noise in the community, fewer environmental impacts and improved safety for workers and travelers. 

The new I-5 structure will look a little different from the bridge currently in place. As the sketch below shows: 
  • The sides of the structure will be filled in, similar to the look of a culvert or tunnel.
  • The structure will be well-lit for the safety of people traveling through it.
  • People who walk, bike or roll in the area will have wider spaces for travel, including improved sidewalks and bike lanes.
Illustration showing the future new I-5 structure over SW 26th Avenue with new bike lanes and wider sidewalks underneath.

Visit the online open house to learn more about this innovative construction method and the improvements on SW 26th Avenue. ​

Collaboration with PBOT

ODOT is collaborating with the Portland Bureau of Transportation on the project elements that affect SW 26th Avenue. This includes connecting to the new multiuse path PBOT is building as part of their OR 99W/SW Barbur Blvd Area Sidewalk Infill Project and adding new sidewalk to continue the connection north to SW Barbur Boulevard. ODOT will connect the end of that sidewalk project through this project's area to SW Barbur Boulevard, thus ensuring continued pedestrian and bicycle infrastructure and connectivity along SW 26th Ave. ​


I-5 |

​I-5 | SW Portland

Cost and Funding

​​The estimated cost to construct this project is $13 million.

Additional Information

​For ADA (Americans with Disabilities Act) or Civil Rights Title VI accommodations, translation/interpretation services, or more information call 503-731-4128, TTY 800-735-2900 or Oregon Relay Service 7-1-1. 

Si desea obtener información sobre este proyecto traducida al español, sírvase llamar al 503-731-4128.

Если вы хотите, чтобы информация об этом проекте была переведена на русский язык, пожалуйста, звоните по телефону 503-731-4128.

如果您想瞭解這個項目翻譯成 繁體中文 的相關資訊,請致電(503)731-4128. 如果您想了解这个项目翻译成 简体中文 的相关信息,请致电503-731-4128.
이 프로젝트에 관한 한국어로 된 자료 신청방법 전화: 503-731-4128.

Nếu quý vị muốn thông tin về dự án này được dịch sang tiếng Việt, xin gọi 503-731-4128.

Qorshayaasha, adeegyada turjumaada/fasiraada, ama wixii macluumaad dheeraad ah ee ADA Title II ama Xuquuqda Madaniga Title VI wac 503-731-4128, TTY (800) 735-2900 ama isticmaal Adeegyada Gudbinta Wararka: 7-1-1.


Contacts & Media


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Project Contact

Community Affairs Coordinator
Ellen Sweeney

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Last Updated

10/14/2022 10:53 AM

Project Number


Project Documents

Related documents to this project
I-5 over SW 26th Ave Project Newsletter fall 2022.pdf