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Project Details

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

Construction Phase

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

Construction began in November 2016 on a project to address congestion on U.S. 26 (Sunset Highway) between Cornelius Pass Road and 185th Avenue.​


Traffic Impact

Update July 27, 2017 

Here are some things to look out for: 

** For the past three months, U.S. 26 westbound has been shifted into a temporary curvy configuration near Rock Creek.  Traffic will be restored to typical straight lanes by the morning of Friday, July 28.

It is now U.S. 26 eastbound’s turn for the same treatment. Beginning Tuesday early morning, August 1, U.S. 26 eastbound between 185th Avenue and Cornelius Pass Road, will be shifted into a new configuration.  This is necessary so the widening project contractor can create a work zone on the south side of the highway at Rock Creek. 

Starting the morning of August 1 and continuing for approximately 4 months, eastbound traffic in a ½ mile section between 185th Avenue and Cornelius Pass Road near Rock Creek, will be shifted north into the center median.  There will still be two lanes of traffic, but the ordinary straight lanes of eastbound 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.  The new traffic configuration may cause some slower than normal speeds as drivers get used to the change.

** The contractor is working in Rock Creek in July and August in order to finish up the bridge construction. Those on Rock Creek Trail will see construction crews in the creek doing the work. Our environmental staff will be there as well ensuring that obtained permits are being adhered to and animal and plant life remain unharmed. 

** The next and last weekend closure of the Rock Creek Trail will likely be in August 

Read the weekly construction update, detailed traffic impacts information updated every Friday.

Construction Impacts

Expect daytime and nighttime work on U.S. 26 and Cornelius Pass Road until Dec. 2018. Visit  the weekly construction update​ for detailed traffic impacts information or

** 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. 

** 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​.

Meetings and Events

** Visit the most recent 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.



This joint project between ODOT, the City of Hillsboro and Washington County will continue through 2018. Read the latest fact sheet (updated Nov. 2016).

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:


US 26 | ​Cornelius Pass Road to 185th Avenue

Cost and Funding

​$​34.5 million

What Problem Will This Improve?

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.

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. 

¿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.

Maps & Media


Project Contact

Community Affairs Coordinator
Lili Boicourt

Last Updated

7/27/2017 4:49 PM

Project Number


Project Documents

Related documents to this project
Fact-Sheet-18806.pdfThis fact sheet details the project purpose, elements and traffic impacts, along with a map of the project area.

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