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The Downtown Seattle Transit Tunnel (DSTT), also referred to as the Metro Bus Tunnel, is a 1.3-mile-long (2.1 km) pair of public transit tunnels in Seattle, Washington, United States. The double-track tunnel and its four stations serve Link light rail trains on the 1 Line as it travels through Downtown Seattle.
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 tunnel portal includes ramps to and from nearby streets, including Dearborn Street, Alaskan Way, and a frontage road along the east side of the highway. [14] 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.
First use of Earth Pressure Balance Machine in Seattle [1] 1987–1988 Downtown Seattle Transit Tunnel: Twin 21.25 ft (6.48 m) 13,624 ft (4,153 m) Tunnelling shield First use of waterproofing PVC membrane in USA [1] 1990 Fort Lawton Tunnel/West Point Sewer 15.5 ft (4.7 m) O.D. 8,400 feet (2,600 m) Partial Earth Pressure Balance Machine [1] [5] 1993
The SR 99 Tunnel is a 2-mile (3.2 km) bored double-decker highway tunnel carrying a section of State Route 99 (SR 99) under Downtown Seattle from SoDo in the south to South Lake Union in the north. Since the 2001 Nisqually earthquake , the replacement of the Alaskan Way Viaduct has been the source of much political controversy demonstrating the ...
Metro Transit began planning a bus-based transit system through downtown Seattle in the 1970s, including a transit mall, tunnel, or bus terminal in the Westlake area. [19] [20] Metro approved construction of a downtown bus tunnel in 1983, [21] selecting Pine Street and 4th Avenue as the site of one of the stations. [22]
The SODO Busway, also referred to as the E-3 Busway, is a 1.5-mile-long (2.4 km) [1] busway in the SoDo neighborhood of Seattle, Washington.It has four stops, including two that connect to Link light rail stations, and functions as an extension of the Downtown Seattle Transit Tunnel, which was formerly used by buses.
Bus lanes were added to sections of SR 522 in Seattle, Lake Forest Park, and Kenmore in the 1990s, and were expanded in the 2000s. [97] In 2002, Sound Transit launched express Route 522, traveling between Downtown Seattle and Woodinville. [98] The route was truncated to the Roosevelt light rail station when it opened in October 2021. [99]