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 four tunnels that carry eight lanes of freeway traffic, plus a separate tunnel for bicycles and pedestrians. The two originals are twin tunnel bores completed in 1940 and rehabilitated in 1993. Two double-decked tunnels and the bicycle/pedestrian tunnel were built north of the original tunnels in 1991. The entire tunnel is listed on the National Register of Historic Places (NRHP), ID #82004243. The east portals of the tunnel, along with the Lacey V. Murrow Bridge, are an official City of Seattle landmark. The official length is 1,440 feet (440 m), though the perceived length while...