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U.S. 26 Widening Project: Cornelius Pass Road to 185th Avenue

Heads up U.S. 26 westbound drivers!  Those of you who drive on U.S. 26 westbound, between 185th Avenue and Cornelius Pass Road, will discover that the traffic flow is shifted into a new configuration.  This is necessary so the widening project contractor can create a work zone on the north side of the highway at Rock Creek.  Starting mid-April and continuing for approximately 4 months, westbound traffic in a ½ mile section between 185th Avenue and Cornelius Pass Road near Rock Creek, is shifted south into the center median.  There will still be two lanes of traffic, but the ordinary straight lanes of westbound U.S. 26 will have broad curves with narrow shoulders as drivers travel between concrete barriers.  Please pay close attention as you drive through this area.

Here are ways to learn more about the project:

** Read the weekly construction updates, detailing the traffic impacts on the project (updated every Friday)

** Visit the online open house (from Nov. 2016) to learn about the construction impacts during this 2-year project

** Visit the first online open house (from Feb. 2016) to learn more details about this project and meet the project staff 

** Email Lili.D.Boicourt@odot.state.or.us​ to be added to the email list for the project

** 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.

** ¿Habla ustéd español? Podemos proveer la información en esta publicación en español. Para recibir la información en español, por favor llamé al 503-731-4128.

Construction began in November 2016 on a project to address congestion on U.S. 26 (Sunset Highway) between Cornelius Pass Road and 185th Avenue.  This joint project between ODOT, the City of Hillsboro and Washington County will continue through 2018.  Read the latest fact sheet (updated Nov. 2016).
What’s the problem?
The stretch of U.S. 26 between Cornelius Pass Road and 185th Avenue has reached its vehicle capacity.  The congestion is particularly evident on U.S. 26 westbound between 185th Avenue and Cornelius Pass Road. The population and employment in Washington County continues to grow, increasing the traffic demand on U.S. 26.  Without improvements, congestion and related crashes are anticipated to increase in the area. 

Project elements
The purpose of this project is to increase capacity, improve traffic safety and relieve congestion in this stretch of U.S. 26, which currently has two lanes in each direction.  Once complete, there will be three lanes in each direction of U.S. 26, from Cornelius Pass Road into downtown Portland.
The project elements include:
  • Widening U.S. 26 to three lanes in each direction between Cornelius Pass Road and 185th Avenue.  The majority of the widening will occur to the inside of the highway, in the highway median.  Highway shoulders will also be widened.

  • Replacing the two Rock Creek bridges with one bridge.  This work will take place over the Rock Creek Trail.  Rapid Bridge Construction will be used to minimize the impacts. Environmental impacts to Rock Creek will be mitigated. 

  • Improving the north side of the U.S. 26/Cornelius Pass Road interchange, including adding a second lane to the westbound off-ramp (the loop ramp).  Washington County is making improvements to Cornelius Pass Road and ramps on the south side of the interchange in a separate project. Learn more about the Washington County project.​

  • Building a noise wall on the north side of U.S. 26 in the Rock Creek neighborhood, starting where the existing sound wall leaves off.  During construction, work on the sound wall will take place off the highway and not impact traffic.
Traffic and noise impacts from Nov. 2016 through Dec. 2018
  • Road users should expect nighttime lane closures on U.S. 26 and Cornelius Pass Road, ramp closures, reduced shoulders and traffic shifts. No daytime lane closures on U.S. 26 are expected.
  • The Rock Creek Trail under U.S. 26 will be closed for two separate weekends and six separate nights - with a detour in place - as the new bridge is constructed. There will also be intermittent flagging on the trail
  • Pile driving is needed at the Rock Creek Bridges.  The pile driving will take place during the day, but will be noisy and cause vibrations.  Pile driving is expected to begin in Dec. 2016 and continue intermittently for a couple of months
  • There will be shoulder closures on U.S. 26 throughout most of the project.  During the shoulder closures, those on bicycles must exit and take the signed detour on local roads
  • Work not requiring lane closures (such as building the sound wall) will take place during the day.
  • Road users should expect increased congestion, noise and delays during construction.
  • There will be periodic nighttime work on this project. Residences and businesses adjacent to the project area may experience daytime and nighttime construction noise. ODOT has obtained a nighttime noise variance from the City of Hillsboro. A noise hotline is available 24 hours a day for reporting noise concerns. That number is 971-673-5239.
US 26 Widening_Overview Map_Web.jpg
(Click on above map to see the full-size version)


More information
** Visit the second online open house (created Nov. 2016) to learn more about the construction impacts during this two year project 

** Visit the first online open house (created Feb. 2016) to learn more about this project and meet the project team 
** The first project open house was held on May 7, 2015.  Below are the handouts and displays from the open house:
Questions or concerns?
Stay in touch by asking questions or providing comments to ODOT directly.  You can also use the contact information below to be added to the email notification list for this project.
Lili Boicourt, ODOT Community Affairs,
PH: 503-731-8247 or Email: Lili.D.Boicourt@odot.state.or.us