How is WSDOT protecting and monitoring the viaduct during Bertha’s time underneath it?

Tags: 99closure, 99safety

The viaduct can withstand some settlement, and WSDOT has implemented a comprehensive program to monitor and mitigate settlement. You can learn more about these efforts in this video

Sections of the viaduct have been reinforced with fiber wrap, and monitoring instruments on the viaduct and surrounding ground can detect movement in real time. Additionally, underground support walls hold soil in place between the viaduct foundation and Bertha’s path.