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I-5 Paving and Auxiliary Lane Project

Participate in the Online Open House​ to watch videos and learn more!

Read the latest fact sheet​ (updated May 2017)

About the Project
The Oregon Department of Transportation (ODOT) is working to improve traffic conditions and highway operations on I-5 from Highway 99W to I-205. This improvement project includes:

** 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
** Adding a second lane at the northbound exit ramp for Lower Boones Ferry Road to relieve congestion

** Repaving I-5 from Highway 99W to I-205. This will extend the service life of the road for another 10-15 years

** Modifying signs, lighting, striping and building retaining walls

Anticipated Project Schedule
Design Phase: Fall 2015 – Summer 2017
Construction Phase: Early 2018 – Fall 2019

During construction, all existing lanes of I-5 will be maintained during weekday daytime hours. Work that could impact travelers will be primarily performed during nights and weekends to minimize traffic impacts. During construction, people can expect traffic delays, nighttime noise and limited ramp closures. 

Auxiliary Lanes - improve highway bottlenecks, reduce congestion and improve safety

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.

More about the 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 Bottleneck Operations Study (CBOS) 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:

This project will repave approximately 5.5 miles of deteriorating pavement along I-5 from Highway 99W to I-205 in both directions. This work will extend highway service life 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. 

Contact Us
For more information, questions or comments, or to get added to the project distribution list, contact ODOT at:
Lili Boicourt, ODOT Community Affairs
Phone: 503-731-8247

We’ll keep you informed about the project and public events. This website will be updated as the project progresses. ​

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.