WSDOT Plans Seismic Upgrades Along Interstate 5, Interstate 405
SEATTLE — State transportation crews will soon begin a series of seismic upgrades along two major freeways, aiming to improve the durability of bridges and overpasses before "The Big One," a Cascadia Subduction Zone earthquake, hits.
The Washington State Department of Transportation worked with the Department of Emergency Management to establish "lifeline routes," deemed critical to preserve paths for emergency vehicles and supplies in the aftermath of a damaging earthquake. The routes include stretches of Interstate 5, from Joint Base Lewis-McChord to Tukwila and North Seattle to Everett, State Route 99 through Seattle, Interstate 405 from the airport to Lynnwood, the State Route 520 bridge, and Interstate 90 between Bellevue and Moses Lake.
WSDOT said around 900 overpasses are on the list for seismic retrofits, and earlier work is already complete on 325 bridges. This summer, contractors will focus on the Northgate Way and Maple Road bridges on Interstate 5 in Seattle and Lynnwood, along with several overpasses along Interstate 405, including those over:
Longacres Drive
SR 520
Northup Way
115th Avenue and BN railroad
Cross Kirkland Pedestrian Trail
The ramp from northbound I-405 to westbound SR 520
-more-
https://www.msn.com/en-us/news/us/wsdot-plans-seismic-upgrades-along-interstate-5-interstate-405/ar-AAZCrzr