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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.
SR 99 was originally a section of U.S. Route 99 (US 99), which was once the state's primary north–south highway before the construction of I-5. US 99 was created in 1926 and replaced earlier local roads that date back to the 1890s and state roads designated as early as 1913.
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 ...
Today, this older route is Washington State Route 11. [citation needed] Beginning in 1952, the other US Route 99 Alternate began in downtown Bellingham and went due north along the Guide Meridian to Lynden and then to Canada. [10] This highway was decommissioned in 1969 and is today known as Washington State Route 539. [11]
Prior to the construction of Interstate 5 in Washington, the viaduct was separated from the bridge by the main north–south corridor: U.S. Route 99 in Washington. By the 1970s, the West Spokane Street Bridge was one of Seattle's worst bottlenecks, due to the large number of ships in Duwamish Waterway and the frequent bridge openings.
Following a month of maintenance and inspections, Bertha resumed tunneling on Friday, April 29, 2016, [4] and crossed 15 feet (4.6 m) under the closed viaduct in an 11-day closure in early May that ended earlier than scheduled. [61] In June 2016, the tunnel reached its lowest point, 115 feet (35 m) under Madison Street in downtown. [62]
Alaskan Way, originally Railroad Avenue, is a major north-south street in Seattle, Washington, that runs along the Elliott Bay waterfront from just north of S. Holgate Street in the Industrial District—south of which it becomes East Marginal Way S.— to Broad Street in Belltown, north of which is Myrtle Edwards Park and the Olympic Sculpture Park.
February 4: A new highway tunnel opens in downtown Seattle to carry a section of Washington State Route 99, replacing the recently-closed Alaskan Way Viaduct. It cost $3.3 billion to construct and took over five years due to delays with its tunnel boring machine, Bertha. [6]