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I-205: Northbound Auxiliary Lane

Design Phase

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

ODOT wi​ll improve safety and operations on I-205 by building a northbound auxiliary lane between the OR 224 (Sunrise Expressway) on-ramp and the Sunnybrook Boulevard/Sunnyside Road interchange exit ramp.

More detailed information for this project is available at​  



​Const​ruction is expected in 2019 and 2020. 



The auxiliary lane will provide additional distance for on-ramp traffic to merge onto I-205 and reduce conflict between merging vehicles. This smooths traffic flow, reduces the potential for crashes and improves reliability.

Additional improvements include:
  • Paving I-205 northbound in the project area.
  • Installing two new sign structures.
  • Storm water and water quality evaluation and planning.

What is an auxiliary lane?
Auxiliary lanes are designed to separate the slower vehicles entering or exiting the highway from the higher speed vehicles continuing to drive along the highway. They are built either from one interchange to the next, or span several interchanges.
Auxiliary lanes reduce conflict, improve traffic reliability and allow for a more stable flow of traffic at interchanges. Ultimately, fewer crashes are expected as the weaving and merging occurs in a separate lane from the rest of the highway.


I-205 | ​OR 224 to Sunnbrook Blvd/Sunnyside Road

Cost and Funding

​​Project cost: $6,500,000

Contacts & Media

Project Contact

Community Affairs Coordinator
Katelyn Jackson

Last Updated

11/20/2019 3:21 PM

Project Number


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