The Alliance for Pioneer Square

Watch the Alaskan Way Viaduct Replacement Project on YouTube

The Washington State Department of Transportation has a YouTube channel dedicated to the big construction project that has dominated the Seattle Waterfront for the past couple of years. Here you’ll find animated videos of how Bertha the world’s largest tunnel boring machine works, loving goodbyes to the old viaduct which the new tunnel will replace, and milestones throughout the project. Above is a video showing Mario driving a go-cart through a simulation WSDOT originally posted of a temporary route for SR 99.

As we’re learning about what’s really blocking Bertha the Tunnel Boring Machine, you may want to get caught up on what Bertha is doing underneath Pioneer Square and why she’s digging a 2-mile tunnel underneath Downtown Seattle. Visit Milepost 31, the information center dedicated to the area’s history and the technology used in the tunnel boring machine. It’s located in Pioneer Square and tours of the nearby launch site are held regularly, as well as a Speaker Series on First Thursdays. There’s also a fabulous historical website called ViaductHistory.com through which visitors can explore the history of the SR 99 viaduct and surrounding neighborhoods. You can even follow Bertha on Twitter!

Contact Us

Alliance for Pioneer Square
310 1st Ave S, Suite 201
Seattle, WA
Phone: (206) 667-0687
Website: http://allianceforpioneersquare.org/
Email: info@pioneersquare.org

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