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The Alaskan Way Viaduct replacement tunnel, also known
as the SR 99 Tunnel, is a bored highway tunnel in Seattle. The 2-mile double-decker
tunnel carries a section of State Route 99 under downtown Seattle.
Construction began in July 2013 using “Bertha”, at
the time the world’s largest-diameter tunnel boring machine. Tunnel
boring was completed in April 2017, and the tunnel opened to traffic on February
4, 2019.
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| BACK OF "BERTHA" AND PARTIALLY COMPLETED TUNNEL WITH CONCRETE WALLS IN PLACE IN 2017 |
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