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Project Details

I-5: Paving and Auxiliary Lane Project

Construction Phase

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

The Oregon Department of Transportation is working to improve traffic conditions and highway operations on I-5 from Highway 99W to I-205.


Traffic Impact

Updated Dec. 7, 2018
Work is continuing most nights and some weekends on this project. Check for nightly ramp closures, as they are happening intermittently and change regularly. View current traffic impact information on the weekly construction update, updated every Friday​​.​

Construction Updates for the Week of Saturday​, December 8th - Friday, December 14th
Expect nighttime lane and ramp closures. Detours will be in place during all ramp closures.

The following northbound and southbound on- and off-ramps will be periodically closed at night next week:

  • Exit 290 toward Lower Boones Ferry
  • Exit 289 toward Nyberg Street 
This project began construction in February 2018. Read the February 2018 fact sheet for more information. Travelers should expect the following impacts:
  • During daytime hours, travel lanes on I-5 will remain open. The lanes on I-5 will be shifted to make room for staging areas.  People will see construction along the highway, day and night.
  • Nighttime lane closures on I-5 will begin as early as 8 p.m.
  • There will be reduced parking at Trimet's Tualatin Park and Ride at SW 72nd & Bridgeport Road.  
  • There will be intermittent night and weekend ramp lane closures.
  • Expect one full weekend closure of the Lower Boones Ferry Road northbound off-ramp in either summer 2018 or summer 2019 (but not during the same weekend as the on-ramp closures). Closure will occur from Friday at 10 p.m. to Monday at 5 a.m.
  • We will provide advance notice of weekend closures when they are known. Check here for up-to-date information.
  • The speed limit will be posted at 55 MPH throughout the construction area. A 45 MPH speed limit is in effect through areas where construction work is actively occurring and workers and equipment are not protected by barrier.
  • There will be a sidewalk closure at the Lower Boones Ferry Road southbound on-ramp throughout construction. A pedestrian detour will be in place.
Residences and businesses adjacent to the project area may hear construction noise during the day and night. ODOT has obtained required noise variances in order to complete the work. ODOT and the contractor will work to minimize the noise as much as possible, but there will be unavoidable noise including back-up alarms. Call the 24-hour noise hotline for noise concerns at 971-673-5239.

Construction Impacts

Q: What's happening on the Sagert Street overpass?  Is it related to this construction project and is work complete?
A: The week of Aug. 6, 2018, an over-height vehicle hit the Sagert Street overpass while traveling on I-5. The bridge sustained damage and was in need of emergency repair. The repairs were completed the end of October 2018 and the bridge is now back to fully functional.

Q: Is the 45 MPH speed limit in effect 24/7?
A: No. To keep workers safe during construction, a new speed zone order will reduce the posted speed limit from 55 MPH to 45 MPH through fall 2018. Speed reductions are in effect through areas where construction work is occurring and workers and equipment are not protected by barrier.  When work is not occuring or it's behind concrete barriers, the speed limit will be 55 MPH.

Q: Why is there construction in the I-5/I-205 interchange?
A: The area in the I-5/I-205 interchange is being used to store the contaminated soil that is excavated from the areas north. The top 18 inches of soil is contaminated with lead, and all that contaminated soil has to be put somewhere different than the clean soil beneath it. There will be trucks in and out of that area over the next several months delivering the contaminated soil.


Design/Engineering: Fall 2015 - Summer 2017 (complete)
Construction: February 2018 - Fall 2019



Read the fact sheet describing the project (from May 2017) 
Project​​ elem​ents 
  • 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, 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

​​$28.3 million


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. 

Maps & 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

12/7/2018 2:26 PM

Project Number


Project Documents

Related documents to this project
Project-Fact-Sheet-18836.pdfThe fact sheet outlines the project elements, schedule and anticipated traffic impacts, along with graphics.
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.

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