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The State Route 99 tunnel, also known as the Alaskan Way Viaduct replacement tunnel, is a bored highway tunnel in the city of Seattle, Washington, United States.The 2-mile (3.2 km), double-decker tunnel carries a section of State Route 99 (SR 99) under Downtown Seattle from SoDo in the south to South Lake Union in the north.
Freighter Fairpartner carrying the disassembled tunnel boring machine into the Port of Seattle in April 2013. Bertha was designed and manufactured by Hitachi Zosen Sakai Works of Osaka, Japan, and was the world's largest earth pressure balance tunnel boring machine, [14] at a cutterhead diameter of 57.5 feet (17.5 m) across.
Seattle Public Utilities held a public naming contest for its latest massive piece of machinery — a tunnel boring machine that will be used to build a storage space for the Ship Canal Water ...
This is a list of tunnels built in the city of Seattle, in the U.S. state of Washington.. The Puget Sound region, where Seattle lies, has a history of glaciation that has left many hills and ridges that civil engineers have needed to traverse for transportation and utilities. [1]
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Northgate Link tunnel: Transit tunnel Completed in 2021 $1.9 billion [13] Brightwater Tunnel: Sanitation infrastructure Completed in 2011 $1.8 billion [14] First billion-dollar tunnel in Seattle University Link tunnel: Transit tunnel Completed in 2012 $1.7 billion [15] Completed $200 million under budget. Central Link light rail service began ...
(The Center Square) – The final segment of Seattle's waterfront revitalization has started construction six years after the Alaskan Way Viaduct was demolished in early 2019. The Bell Street ...
The Alaskan Way Viaduct ("the viaduct" for short) [1] [2] [3] was an elevated freeway in Seattle, Washington, United States, that carried a section of State Route 99 (SR 99). The double-decked freeway ran north–south along the city's waterfront for 2.2 miles (3.5 km), east of Alaskan Way and Elliott Bay, and traveled between the West Seattle Freeway in SoDo and the Battery Street Tunnel in ...