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Bertha was a 57.5-foot-diameter (17.5 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle, Washington, United States. [2]
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.
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 ...
Bertha, one of the world’s largest tunnel boring machines, emerged north of downtown Seattle on Tuesday.
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] Some of these tunnels are part of megaprojects.
The tunnel travels 1.8 miles (2.9 km) under Downtown Seattle and carries SR 99 along the central waterfront, running roughly parallel to the former Alaskan Way Viaduct. It is arranged with two stacked decks, carrying two lanes of southbound traffic on the upper deck and two lanes of northbound traffic on the lower deck. [15]
During the construction of the State Route 99 tunnel, the Bertha tunnel boring machine became stuck in rocks near Ballast Island, triggering significant archaeological interest in the former island, alongside concerns that the tunnel boring may have inadvertently disturbed the remains of the site.
Tunnels in Seattle (1 C, 5 P) Pages in category "Tunnels in Washington (state)" ... Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; ...