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I-5: Paving and Auxiliary Lane Project

Construction Phase

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

We are working to improve traffic conditions and highway operations on I-5 from Highway 99W to I-205.​​​​​​​​​​​


Traffic Impact

Updated Feb. 18, 2020
No more traffic impacts expected on this project.

The main project elements are complete.  The remaining work is for the contractor to do cleanup work, and will not impact traffic.

Construction Impacts

No more traffic impacts are expected on this project.


Design/Engineering: Fall 2015 - Summer 2017 (complete)
Construction: February 2018 - early 2020



Project​​ elem​ents 
  • (complete) Adding a single southbound auxiliary lane on I-5 from north of Lower Boones Ferry Road to I-205 to relieve congestion and reduce crashes. The auxiliary lane work includes on- and off-ramp lane modifications at Lower Boones Ferry Road and Nyberg Street, and the on-ramp to I-205. 
  • (complete) Adding a second lane at the northbound exit ramp for Lower Boones Ferry Road to relieve congestion. 
  • (complete) Repaving I-5 from Highway 99W to I-205, approximately 5.5 miles. This will extend the service life of the road for another 10-15 years. By combining the pavement and southbound auxiliary lane work, the project will take advantage of cost savings and reduce construction impacts to travelers. 
  • Modifying signs, lighting, striping and building retaining walls.​
​Auxiliary Lanes - improve highway bottlenecks, reduce congestion and improve safety 
The graphic shows that an auxiliary lane will be built on I-5 south between OR 217 and I-205.A recent ODOT study found that auxiliary lanes are an effective way to reduce bottleneck congestion. An auxiliary lane typically provides a direct connection from one interchange ramp to the next. In fact, there is an existing auxiliary lane from the Hwy 217 off-ramp to the Lower Boones Ferry Road off-ramp. This project extends that auxiliary lane to I-205 to improve safety and traffic flow along I-5.​

Auxiliary lanes separate on- and off-ramp merging from through traffic. They require less weaving and merging, reducing congestion in all lanes. 

Bottleneck Study 
In 2009, ODOT began a new approach to deal with major recurring bottlenecks on local freeways and develop cost-effective improvements to address safety and assess traffic movement at certain locations. 
The Federal Highway Administration has found that approximately forty percent of all congestion is predictable, caused by bottlenecks or physical constraints of the roadway. Many bottleneck locations are also high-crash sites. Crash incidents increase congestion levels, causing more delay and longer recovery time for the freeway. 
The Corridor Bot​tleneck Operations Study​ identified areas of recurring congestion along five key Portland metro area corridors (I-5, I-205, I-84, I-405 and US 26). The study recommended low-cost, highly effective solutions to improve safety and reduce congestion at these locations. In many cases, auxiliary lanes were the recommended solution. Learn more about the study by reading visiting the CBOS website​, reading the CBOS fact sheet​ and by viewing the CBOS video​​.​​


I-5 | ​from Highway 99W to I-205​

Cost and Funding

Project cost: $30,079,959.00


Oregon Mainline Paving

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.

¿Hablas español? Podemos proporcionar la información de esta publicación en español. Para recibir información por favor llame al 503-731-4128. 

Contacts & Media

The image shows a map of the project area with project descriptions pointing to each geographic area

Project Contact

Community Affairs Coordinator
Lili Boicourt

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Last Updated

2/12/2020 10:01 AM

Project Number


Project Documents

Related documents to this project
CBOS-Fact-Sheet-18836.pdfThe Corridor Bottleneck Operations Study identified areas of recurring congestion along five key Portland metro area corridors and recommended low-cost, highly effective solutions to improve safety and reduce congestion at these locations.
FactSheet_Feb2018_18836.pdfThis fact sheet details the traffic impacts expected on this project from February 2018 to fall 2019.
Project-Fact-Sheet-18836.pdfThe fact sheet outlines the project elements, schedule and anticipated traffic impacts, along with graphics.

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