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Project-Details







I-5 Over 26th Avenue Improvements

Construction Phase

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


​​​​​​This project will improve the I-5 bridge over SW 26th Avenue in Southwest Portland with a new structure and upgrade SW 26th Avenue with better lighting, bike lanes, and sidewalks. This project is necessary to replace a worn-out bridge structure on I-5, bring it up to current seismic standards, and ensure continued reliability for travelers. The construction method selected allows I-5 to remain open for all but one weekend - 9 pm June 28 to 5 am July 1.


Impacts

Traffic Impact

  • I-5 will close for 4 miles south of downtown Portland from 9 p.m. Friday, June 28 to 5 a.m. Monday, July 1. Details shared below.
  • SW 26th Avenue reopened to vehicles under I-5 on May 1. It will close again during the weekend I-5 is closed (June 28 – July 1).
  • An accessible pedestrian pathway is available on SW 26th Avenue during construction. The location of the pathway shifts depending on the construction. Watch for signage.
  • Periodic lane and shoulder closures occur on I-5.​

Construction Impacts

​Join our online open house to learn more!

Impacts include weekend closure of I-5 and single and double lane closures on I-5. The construction method selected allows I-5 to remain open for all but this one weekend. It also saves an estimated $5.5 million in costs and six months of construction time, as well as reduces the impact on traffic, reduces nighttime noise, reduces the environmental impact and improves safety for workers and drivers. There’s a fact sheet on our website that explains more about why we chose this construction method. Details shared below.​ 

Construction began in April 2023 and continues through fall 2024.

I-5 Traffic Impacts:
  • This summer, I-5 will close for 4 miles south of downtown Portland from 9 p.m. Friday, June 28 to 5 a.m. Monday, July 1. During the closure, there will be a regional detour using I-205, I-405, U.S. 26 and OR 217 and a signed local detour. Scroll down to see the detour maps.
  • Up to 10 nighttime directional closures of I-5 (five northbound and five southbound) from ​11 p.m. to 5 a.m.
  • The following impacts are also planned to allow for completion of the work:
    • Nighttime single lane closures on I-5 in both directions from 8 p.m. to 5 a.m. on weekdays and from 8 p.m. to 8 a.m. on weekends.
    • Within 90 days of the weekend closure, I-5 in and near the project area will have up to 30 nights of double lane closures in both directions from 10 p.m. to 5 a.m. for prep work, striping, and placement of shoulder barrier.
SW 26th Avenue Traffic Impacts:
  • SW 26th Avenue reopened to motor vehicles May 1. It will close again during the weekend I-5 is closed this summer.
  • An accessible pedestrian pathway is available during the SW 26th Avenue closure. There may be flagging directing travelers to maintain safety. Watch for signage.

I-5 Ramp Closures and Detours

I-5 will be closed for over 4 miles from 9 p.m. Friday, June 28 to 5 a.m. Monday, July 1. 

​ODOT worked with the contractors to determine the dates of the closure to coordinate that most of the I-5 work can be completed during this one weekend closure. This allows us to give advanced notice of the closure. The closure allows crews to safely complete work to remove the top of the existing bridge and add a new asphalt bridge deck.

I-5 closure map showing freeway and on-ramp closures.

I-5 Weekend Closure Map


  • Southbound I-5 will close between the SW Terwilliger Boulevard off-ramp and the SW Capitol Highway on-ramp.
  • Northbound I-5 will close between the SW Barbur Boulevard off-ramp and the SW Terwilliger Boulevard on-ramp.


​Several on-ramps will also close to prevent drivers from getting on I-5 in the area during the closure.

  • Southbound on-ramp closures:
    • S Harbor Drive.
    • Interstate 405 southbound exchange to southbound I-5.
  • Northbound on-ramp closures:
    • ​SW Spring Garden Street.
    • SW Capitol Highway.
    • OR99W/SW Barbur Boulevard.
    • SW Haines Street.
    • Kruse Way.

During the closure, regional detours will use I-205, U.S. 26, I-405 and OR 217. A signed local detour will use SW Barbur Boulevard. This detour maintains local access. Congestion is to be expected during the I-5 weekend closure.


Illustration of project area showing that the Regional Detour will use Interstate 205 and OR 217

Regional Detour will use Interstate 205 and OR 217

Illustration of project area showing that the Local Detour will use SW Barbur Boulevard

Local Detour will use SW Barbur Boulevard

Nighttime I-5 Traffic Impacts

To prepare for and complete the bridge replacement work safely and with minimal impacts, additional nightwork is required on I-5. This may include:​​

  • Nighttime single lane closures on I-5 in both directions from 8 p.m. to 5 a.m. on weekdays and from 8 p.m. to 8 a.m. on weekends.
  • Within 90 days of the weekend closure, I-5 in and near the project area will have up to 30 nights of double lane closures in both directions from 10 p.m. to 5 a.m. for prep work, striping, and placement of shoulder barrier.
  • Up to 10 nighttime directional closures of I-5 (five northbound and five southbound) from 11 p.m. to 5 a.m.

We are limiting nighttime work to 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 noise mitigation measures to reduce noise. Use the 24/7 nighttime noise hotline to discuss any noise concerns: 503-276-7892.

Construction Method Reduces Impacts

Replacing a bridge is expensive, time-consuming and can be disruptive to traffic and the surrounding communities. To minimize impacts, we evaluated options and chose the one with lower costs, shorter construction time, fewer traffic impacts, less nighttime noise, fewer environmental impacts and improved safety for workers and drivers.

Work began on the I-5 bridge nearly a year ago. We’re using a construction method that builds the new bridge underneath the existing bridge while I-5 remains open. This summer, we’ll finish the work by removing the top of the existing bridge and adding new asphalt paving — all during just one full weekend.

SW 26th Avenue Closure

Last spring, SW 26th Avenue closed to motor vehicles under I-5 and SW Barbur Boulevard. SW 26th Avenue reopened May 1. It will close again during the weekend I-5 is closed (June 28 to July 1).​ This allows for equipment access and to ensure safety while work is happening above SW 26th Avenue on I-5.

An accessible pedestrian pathway is available during construction. The location of the pathway shifts depending on the construction. People walking, biking and rolling have access under I-5 for most of the project. Travelers on bikes will need to walk through the project area. If we do need to completely close SW 26th Avenue under I-5 to people walking, biking and rolling, we will provide a shuttle to transport people to the other side of SW 26th Avenue.

Illustration of the SW 26th Avenue Closure Area Map

SW 26th Avenue Closure Area Map

Illustration of the SW 26th Avenue Detour Map

SW 26th Avenue Detour Map

SW 26th Avenue Improvements

As part of this project, we are improving SW 26th Avenue with better lighting, bike lanes, and sidewalks. Crews have built a new structure underneath I-5 and completed most of the improvements to SW 26th Avenue. A newly paved SW 26th Avenue has reopened May 1. 

Crews finished building new, wider sidewalks, installing ADA-compliant curb ramps, paving and striping SW 26th Avenue with bike lanes and painting the new structure and installing light fixtures. The sides of the new structure are filled in, similar to the look of a culvert or tunnel (see illustration). 

There are still a few items to finish on SW 26th Avenue, such as connecting the lights, final striping and planting vegetation. Boston Ivy (non-invasive) will be planted on the outside of the structure to help soften the look of concrete, blend in with the nearby green space, and deter graffiti.


See our progress on SW 26th Avenue


Illustration of a bike path and underpass for SW 26th Avenue

A sketch of the future improvements on SW 26th and the new structure, viewed from SW 26th Avenue looking southeast.

Ariel view of I-5 construction

An aerial view of the I-5 construction, February 2024.
​​

An improved SW 26th Avenue, May 2024.

An improved SW 26th Avenue, May 2024.

C​ollaboration with PBOT

​ODOT is collaborating with the Portland Bureau of Transportation on the new features we’re building on 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 bike lanes on SW Barbur Court, improving continued pedestrian and bicycle infrastructure and connectivity in the area.

Intersection Improvements for SW 26th Avenue and SW Barbur Court

SW 26th Avenue and SW Barbur Court: upgrades include new curb ramps, bike striping and high-visibility crosswalks.


Meetings and Events

Online Open House

Join our online open house! You can explore the online open house​ to learn more about the project background, construction progress, upcoming impacts, and how the construction method selected helped us lower costs, impact, and construction time and allowed I-5 to remain open for all but one weekend.

Schedule

Spring 2023: Construction starts, SW 26th Avenue closed to vehicle traffic for about a year starting May 1, 2023.

Summer 2024:​ Full closure of I-5 in both directions for one weekend from Friday, June 28 at 9 p.m. to Monday, July 1 at 5 a.m. Additional nighttime lane closures will also be required.

Details

About

Project Overview and Background


ODOT is improving 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.

In spring 2023, SW 26th Avenue closed to motor v​ehicles under I-5 and SW Barbur Boulevard while the new structure is being built underneath the existing I-5 bridge and improvements are made to SW 26th Avenue. Building a new I-5 structure with this approach​ lowers project costs, shortens construction time, eases traffic impacts, has fewer environmental impacts and improves safety for workers and travelers.The majority of work visible from I-5 will occur in summer 2024 with a​ weekend closure of I-5 from Friday, June 28 at 9 p.m. to Monday, July 1 at 5 a.m. (traffic impacts described on the web page.)

Project Area Map

Illustration of project area map


Location

I-5 |

SW Portland


Cost and Funding

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


Additional Information

Other Area Projects:

RealTime Signs Ross Island Bridge–SW Terwilliger

ODOT is installing 12 RealTime Variable Advisory Speed (VAS) signs along a busy stretch of Interstate 5 from the Ross Island Bridge to Terwilliger Boulevard. Realtime VAS signs give drivers notice to slow down before they reach a problem area—improving traffic flow and helping to reduce rear-end crashes and congestion. Visit the I-5 ODOT RealTime Signs​ project website to find out more.

OR 217

This project will improve safety and reduce bottlenecks on OR 217 by adding auxiliary lanes, or ramp to ramp connections, between Beaverton-Hillsdale Highway and OR 99W. Construction is underway on OR 217 and surrounding streets! Visit the OR 217 project website to find out more.

I-205 Abernethy Bridge Project

This project will make the Abernethy Bridge the first earthquake-ready interstate bridge over the Willamette River in the Portland area. We are also improving on- and off-ramps near the bridge, along with making improvements to local bike and pedestrian routes. Visit the I-205 Abernethy Bridge project website to find out more.

OR99W: (Barbur Blvd) SW 26th Way - SW 26th Ave

The 2024-2027 STIP just selected this pedestrian safety project for funding. This project has not begun, but preliminary information can be found on page 70 of the R1 STIP document.

I-5 Aurora-Donald Interchange at Exit 278

This project is the final phase to build the full diverging diamond interchange. To do this we are replacing the two I-5 bridges at the exit with one new bridge. We’ll also widen and lengthen the freeway ramps to help with queuing. Visit the Aurora-Donald Interchange project website to find out more.

​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.

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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.

20486-Arabic-ADA.jpg

Contacts & Media

https://www-auth.oregon.gov/odot/Projects/Project%20Images/sw26_illustration.jpg

Project Contact

Community Affairs Coordinator
Ellen Waters
Email
Ellen.WATERS@odot.oregon.gov
Phone
971-336-1249

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Last Updated

5/22/2024 4:58 PM

Project Number

20486

Project Documents

Related documents to this project
I-5 over SW 26th Ave Project Mailer Spring 2024.pdfSpring 2024 Project Mailer
I-5 Over SW 26th Construction Approach Decision One Pager Spring 2022.pdfA one page document showing why we selected the construction approach.
I-5 over SW 26th Ave Project Mailer Spring 2024_SP.pdfSpring 2024 Project Mailer - Spanish
I-5 over SW 26th Ave Project Mailer Spring 2024_SM.pdfSpring 2024 Project Mailer - Somali
I-5 over SW 26th Ave Project Mailer Spring 2024_AR.pdfSpring 2024 Project Mailer - Arabic