Mount Baker Tunnel WA
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Description: The Mount Baker Tunnel, located in Seattle, Washington, is a significant engineering marvel that forms part of the Interstate 90 (I-90) corridor. Officially opened in 1940, it was one of the first major highway tunnels in the United States and remains one of the longest in the country. The tunnel runs beneath the Mount Baker Ridge, connecting the neighborhoods of Mount Baker and Leschi, and plays a crucial role in facilitating east-west traffic flow across Lake Washington. It features a unique double-deck design, with the upper deck accommodating vehicular traffic and the lower deck originally designed for rail transit, though it now serves as an express lane for buses and carpools. The Mount Baker Tunnel is not only a vital transportation link but also a testament to innovative mid-20th-century tunnel construction techniques.