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Mount Baker Tunnel
The Mount Baker Tunnel or Mount Baker Ridge Tunnel carries Interstate 90 under the Mount Baker neighborhood of Seattle, Washington. It is actually a group of three tunnels that carry eight lanes of freeway traffic, plus a separate path for bicycles and pedestrians. The two originals are twin tunnel bores completed in 1940 and rehabilitated in 1993. The newest tunnel was built north of the original tunnels in 1991 and has a double-decked roadway with the bicycle/pedestrian path above the traffic lanes.
The entire tunnel is listed on the National Register of Historic Places (NRHP), ID #82004243.〔 The east portals of the tunnel, with murals designed by artist James FitzGerald, along with the Lacey V. Murrow Bridge, are an official City of Seattle landmark.〔(Landmarks Alphabetical Listing for L ), Individual Landmarks, Department of Neighborhoods, City of Seattle. Accessed 28 December 2007.〕
The official length is ,〔(Preliminary List of Nationally and Exceptionally Significant Features of the Interstate Highway System (US DOT) )〕 though the perceived length while driving is closer to a because of a cut-and-cover "lid" between the western portal and the beginning of the actual tunnel under the Mount Baker ridge. The eastern end of the tunnel links to the I-90 floating bridge on Lake Washington.
At in diameter, it is the world's largest diameter soft earth tunnel, having been bored through clay.〔〔(【引用サイトリンク】title=WSDOT historic bridges )〕〔(Alaskan Way Viaduct and Seawall Replacement - Frequently Asked Questions (see ''What experience does WSDOT have with building tunnels?'') )〕
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