Boeing Access Road over Airport Way Seismic Retrofit

Project Overview

Boeing Access Road is a principal arterial connecting I-5 and East Marginal Way South. It is considered regionally significant and is included on the National Highway System for access to the Boeing Company and the King County Airport at Boeing Field. The Boeing Access Road over Airport Way Bridge is the only remaining structure on the Boeing Access Road corridor that has not been seismically upgraded. This improvement would allow the entire corridor to be seismically resistant during a seismic event.

The seismic retrofit to the bridge consists of an upgrade to the east and west approach slabs on Boeing Access Road. During the construction of the approach slabs, Boeing Access Road will be reduced from two (2) lanes in each direction to one (1) lane in each direction. Daily commuters are asked to be aware of the reduction and use alternate routes during this portion of the construction project.

A majority of the construction work will be located under the bridge on Airport Way. Construction crews will be placing steel jackets around the concrete columns and will be adding  strength members to the concrete girders. Traffic using Airport Way will be adjusted around the construction zone to allow construction crews access to the bridge columns without reducing traffic lanes.

Please note that traffic volumes could be higher in this area due to the closure of the West Seattle Bridge.


Project Status Update – 1/14/21

Construction crews will be rerouting traffic to the north side of the Boeing Access Road over Airport Way on January 14, 2021. Traffic will continue to be restricted to 1 lane in each direction as construction crews continue to work on the bridge approach slabs. Temporary traffic signals will continue to be implemented on eastbound Boeing Access Road to assist merging traffic from Airport Way.

The speed limit is 25 mph through the traffic revision for driver and construction workers safety; please be mindful of the reduced speeds.

Barring any weather or construction delays, the bridge structure will be fully reopened to four lanes, two lanes in each direction, mid-February.


Contact Information

For specific  questions or concerns you may contact Adam Cox, Bridge Project Manager at (206) 431- 2446 or via email at

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