Thornton Creek Bridge Study

Updated: April 29, 2019

What’s happening now?

We’re currently studying 4 bridges in the Matthews Beach neighborhood of northeast Seattle. The bridges each carry thousands of vehicles per day across the Thornton Creek Channel and are, on average, over 65 years old.

The bridges are showing signs of deterioration; therefore, we are exploring rehabilitation and replacement options.

Our primary goal is to identify affordable solutions that address the transportation needs of all people using the bridges. It is important to note that these bridges will remain safe to use while we conduct this study.

We will engage surrounding community members in the summer of 2019 to gather feedback on possible design alternatives should the need arise.

You can join our email list to stay up to date with latest project information. We will send emails at major milestones. If construction is required, we will work closely with community members to communicate construction schedules and details.

The study is being conducted as part of the 9-year Levy to Move Seattle approved by Seattle voters in 2015.

Project Overview

There are 4 bridges being studied during 2019. All the bridges cross Thornton Creek Channel:

  • Bridge 105 is on NE 110th St, 200 feet east of the intersection with 35th Ave NE
    School bus crossing bridge
  • Bridge 115 is on 39th Ave NE, 120 feet north of the intersection with NE 105th St
    Truck crossing bridge
  • Bridge 104 is on NE 105th St, at the intersection of 40th Ave NE
    The bridge
  • Bridge 109 is on 45th Ave NE, 70 feet south of the intersection with NE 97th St
    The Bridge 109

Various experts will be visiting each bridge to study their current condition and to write a report detailing their findings. These experts will examine many factors, including the structure of the bridges, the condition of the soil beneath them, the flow of the creek, and the potential environmental impacts of any work.

The bridge study will cause minimal disruptions. Explorations to examine soil and groundwater conditions for each bridge will require one lane be closed for a day while drilling is conducted. Flaggers will direct traffic during work hours. Following completion of this work, holes will be filled, and the surface will be patched to its original surface.

We will complete this study before the end of 2019 and share recommendations with the community in order to secure feedback from all interested parties.

Project Location

Map showing location of four bridges in this survey


The elements of this preliminary study will be ongoing throughout 2019. They will include public meetings. The schedule for these meetings will published here once determined.


This study has been funded through early planning. Funding for design and construction will be evaluated following a review by the Levy to Move Seattle Oversight Committee.

Planning Phase

Get Involved

We will be sharing information and seeking public input throughout this project. Your feedback will help ensure that designs reflect the needs of the community. To sign up for email updates on the project, please contact our communication lead, Darrell Bulmer at

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