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15th Avenue NE at 105th Street Bridge Rehabilitation Project

Updated 5/31/11

This project has been successfully completed.  Thank you for your patience during the construction. This project was funded by Bridging the Gap, a voter-approved $365 million dollar levy for transportation maintenance and improvements.

Project/Construction Update 04/01/2011

Placement of the new concrete deck overlay, the final major milestone for the 15th Ave NE @ 105th Ave NE Bridge Rehab project, is now complete! This is significant because major work on the bridge had to be put on hold until unfavorable weather conditions improved.  With the required minimum of three consecutive days of no rain, and moderate temperatures, finally met last week the underlying surface of the deck could be properly prepared for placement of the overlay. The contractor is now completing some finishing tasks, which include the installation of a separation barrier and roadway striping. The bridge is expected to reopen to all traffic by April 15th, barring any adverse weather conditions.


Project Description

The Seattle Department of Transportation (SDOT) is rehabilitating the bridge that crosses Thornton Creek on 15th Avenue NE at 105th Street. Due to age and increased traffic volumes, the bridge has deteriorated to the extent that delaying the proposed repairs would result in more significant repairs, longer construction duration, and higher cost.

Project Benefits

Improves safety.

  • Corrects structural deficiencies.
  • Repairs the pedestrian railing.
  • Increases pedestrian comfort by providing a physical separation between the sidewalks and traffic lanes.

Protects an important asset.

  • Extends the bridge’s useful life.

Reduces the City’s maintenance backlog.

  • Contributes to the improvement of Seattle’s transportation system.

Improvements include:

  • Strengthening the bridge structure.
  • Repaving the bridge surface.
  • Correcting settlement problems on the south approach to the bridge.
  • Replacing expansion joints.
  • Repairing cracks and spalls in concrete.
  • Adding a separation railing between the sidewalks and the traffic lanes.
  • Increasing the substandard height of the pedestrian railing.
  • Correcting erosion problems under the bridge.

Construction Information

  • Construction began on May 17, 2010 and is anticipated to end in March 2011. During construction, the bridge is closed to all traffic, including vehicles, buses, bicycles, and pedestrians. Traffic will be diverted to Roosevelt Way NE and Lake City Way NE/SR 522 and Northgate Way during the bridge closure period. See detour map for details.

    The bridge is also closed to pedestrian and bicycle traffic during construction. Closure signs and information flyers are posted at each end of the bridge to help pedestrians and bicyclists identify alternative routes. See flyer for details.
  • On February 6, 2010 as part of Metro’s scheduled winter service change, Metro bus routes 73, 77, and 373 were rerouted. Details are available online. For additional route information or questions, visit or call Metro Rider Information at (206)553-3000.

Environmental Considerations

  • SDOT has determined that the project is unlikely to have significant adverse impacts on the environment and issued a Determination of Nonsignificance (DNS) on Thursday, August 13, 2009. This decision was made after review of the project's potential impacts on several elements of the environment, as summarized in the SEPA environmental checklist .

Project Funding

This project is funded by the Federal Highway Administration (FHWA) and Bridging the Gap , a voter-approved $365 million dollar levy for transportation maintenance and improvements.

Over the next nine years, Bridging the Gap will address the City’s mounting transportation problems and create a strong foundation for Seattle’s transportation future by reducing the infrastructure backlog and investing in major transportation projects.

Want to Learn More?

The project team will balance the impacts of construction while achieving the project’s goal of providing a safe and functional bridge. SDOT will work closely with the community to share project information, answer questions, and address concerns.

For the latest news and information, or to request a project briefing, contact:

Kit Loo
Project Manager
(206) 684-3669

Maribel Cruz
Project Communications
(206) 684-7963




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