Virtual Tour

SR 99 tunnel virtual tour

Welcome to our virtual tour of the SR 99 Tunnel Project, the next closest thing to taking a stroll through the construction zone. Captured by photographer Bill Edwards in summer 2014, these images give you a first-hand look at the complexity and enormity of this project. Each of the thumbnails below will link you to a different section of the tour. For the best experience, we suggest you try the full-screen view. Please be aware that these images exist on an external website that is not owned or operated by WSDOT.  

Tour stops

Above The Tunnel Launch Pit, SR 99 Tunnel Project, Seattle, WA

Stop 1: Above the launch pit
A 360-degree view from a walkway above the tunnel launch pit.

South Portal Cut and Cover, SR 99 Tunnel Project, Seattle, WAStop 2: South cut-and-cover
A 360-degree view of the cut-and-cover tunnel south of the launch pit.
View From Inside the Tunnel Launch Pit, SR 99 Tunnel Project, Seattle, WAStop 3: Bottom of the launch pit
A 360-degree view at the bottom of the launch pit.
Hydraulic Push Jacks In the TBM, SR 99 Tunnel Project, Seattle, WA
Stop 4: Tunnel's northern edge
A 360-degree view of the bored tunnel's northernmost edge.
Inside the Tunnel Boring Machine, SR 99 Tunnel Project, Seattle, WA
Stop 5: Below Bertha
A 360-degree view from below the world's largest tunneling machine.
Lower Deck, TBM Receiving Pit, N Portal, SR 99 Tunnel Project, Seattle, WAStop 6: Tunnel receiving pit
A 360-degree view of the spot where tunneling will end.
Broad St Construction, N Portal, SR 99 Tunnel Project, Seattle, WAStop 7: The tunnel's north portal
A 360-degree view of the SR 99 tunnel's future north portal.
Upper Deck, TBM Receiving Pit, N Portal, SR 99 Tunnel Project, Seattle, WAStop 8: North cut-and-cover 
360-degree view of the cut-and-cover tunnel at the north portal.
Above the TBM Receiving Pit, N Portal, SR 99 Tunnel Project, Seattle, WAStop 9: Operations building
A 360-degree view of the north portal operations building.

Have questions about what you're seeing?

There's a lot happening in these images, much more than we can highlight in a short caption. If you have questions about anything you see, email us at viaduct@wsdot.wa.gov, tweet @BerthaDigsSR99 or call 1-888-AWV-LINE (298-5463)