West Sammamish River Bridge Replacement

Staff Contact

John Vicente

Capital Projects Manager

(425) 398-8900





West Sammamish River Bridge Frequently Asked Questions (FAQ) Sheet 

De Minimus Information

Open House Presentation Slides

Current Status:

Design Start:  May 2015
Design Complete:  Fall 2018
Construction Estimated Start:  1st Quarter 2020



The City began design of the new bridge in May 2015.  Design will take approximately 3-1/2 years as the City secures the necessary permits, right of way, and prepares the plans and specifications. Construction is expected to begin in the Spring of 2019, pending availability of funding.

The City hosted an open house event on January 26, 2017. Bridge concepts, potential construction sequencing, and some brief history were presented. The presentation slideshow is available for viewing under "Documents" at the left. There is also an expectation that recreational activities will have some potential impacts. These were discussed at the open house. Information about de minimus impacts is also included under "Documents" at the left.

An open house was also held on July 20, 2017 to discuss impacts to river traffic during construction. Impacts are likely to consist of occasional closures of the river to boat traffic during the evening hours. There will also be intermittent short term closures and/or delays in crossing under the bridge. The access road under the bridge (connecting Rhododendron Park and Kenmore Boat Launch) will be closed for the duration of construction.


The West Sammamish River Bridge carries southbound traffic over the Sammamish River on 68th Ave NE. The bridge was constructed in the 1930s and nears the end of its life. Over the past year, the City has increased monitoring of the structure, and in March of 2014 Council-approved weight restrictions went into effect. The City has completed a scour analysis (underwater erosion of soil around the piers), geotechnical review, and a load limit study. The southbound bridge is currently load restricted until the bridge is replaced.


Project Description:

The project will replace the existing west bridge (southbound travel lanes) with a new structure. Work will also involve replacing the approaches to the bridge between NE 170th St and NE 175th St.



The project is funded by the FHWA's Highway Bridge Programs for $12M, Transportation Improvement Board funding for $6.9M, federal STP funds of $1.6M and the Connecting Washington State fund for $8M. Local Kenmore funds of $3M will also be used for the project.


Last updated: Tue, 03/19/2019 - 10:46am