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Project Details

​​SW 12th Avenue bridge over I-405 maintenance

Construction Phase

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

​This spring, we began maintenance on the SW 12th Ave bridge over I-405. This work improves the weight capacity by reinforcing concrete with steel rebar, which will maintain the long-term safety and use of this heavily traveled bridge. Work includes drilling into the bridge support columns from the bridge deck and adding steel rebar to reinforce the concrete.

Work has begun with intermittent daytime flagging and is expected to be complete in summer 2019 but is subject to change based on weather and site conditions


Traffic Impact

​One lane of the SW 12th Ave bridge over I-405 will remain open at all times. Flaggers will direct one-way traffic during the work and during concrete curing times. Lane closures are needed to maintain a safe work zone for the traveling public and construction staff, and to allow enough time for newly poured concrete to adequately cure before the bridge can be re-opened to two-way traffic.

Traffic delays are expected. Nighttime flagging may also occur during concrete curing times.

Traffic Impacts Include
  • Daytime single lane closures on the SW 12th Ave bridge over I-405.
  • Occasional nighttime single lane closures may occur during times to allow concrete to cure.
  • ​Flaggers will direct auto, pedestrian and bicycle traffic during construction.
  • No impacts to I-405 are expected.
  • Work has begun with intermittent daytime flagging. 
A map of 12th Ave bridge maintenance and surrounding areas.

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

Visit​​ for up-to-date traffic impacts.

Construction Impacts

Daytime and nighttime construction noise will occur periodically from heavy equipment, construction trucks, beeping vehicle reverse noise (a requirement by the Occupational Safety and Health Administration), and other equipment such as compressors, pneumatic tools, and potentially nighttime flagging with generators. Those working or living in the area may be affected. The majority of the work will happen during the day.

ODOT will apply construction noise mitigation measures to reduce noise impacts to surrounding neighbors.

Use the 24/7 nighttime noise hotline to reach a live person to discuss any noise concerns: 503-969-1094


​​Work has begun with intermittent daytime flagging.



Due to the changing nature of vehicle weights, bridge load ratings need to increase to meet current design standards. In addition, concrete compresses from use over time and needs maintenance. By adding more steel rebar into the bridge support columns, bridge stability and load capacity is improved.

What Are The Benefits of This Project?
Maintains the safety of our roads: This work will maintain long-term safety by ensuring this bridge can continue serving travelers.
Improves our roads: Steel rebar in the bridge columns and reinforced concrete will increase the stability and load capacity of the bridge.

What You Can Expect To See 
Work will be performed from the deck of the SW 12th Ave bridge and will be visible during the day. People using the sidewalk may have periodic stops and will see construction equipment on the bridge. Flaggers will be directing one- way traffic across the bridge. Lane closures allow time for poured concrete to cure. SW 12th Ave bridge will remain open at all times.


I-405 | ​​SW 12th Avenue bridge over I-405

Cost and Funding

Additional Information

​For 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 usted español? Podemos proveer la información en esta publicación en español. Para recibir la información en español, por favor llamé al (503) 731-4128. ​

Contacts & Media

Project Contacts

Community Affairs Coordinator
Lili Boicourt

Community Affairs Coordinator
Ellen Sweeney

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Last Updated

7/24/2019 4:05 PM

Project Number


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