SR 99 tunnel south portal concept

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    Design concept of the State Route 99 tunnel's south portal, looking northwest toward downtown Seattle. WSDOT selected Seattle Tunnel Partners to design and build the tunnel. This visualization is based on their design proposal and is subject to change.

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    1. WSDOT 37 months ago | reply

      Freight trips leaving Port of Seattle terminals will have improved access to I-5 and I-90 as a result of SR 519 and Spokane Street improvements and a new grade-separated connection near Terminal 46, which is included in the Alaskan Way Viaduct Replacement Program. More information is available at

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