The Alaskan Way Viaduct Replacement Tunnel is a bored road tunnel that is under construction in Seattle. It is scheduled to open in late 2015. The 2-mile tunnel will carry State Route 99 under downtown from the Sodo neighborhood to South Lake Union in the north.
Since 2001, the proposed replacement of the Alaskan Way Viaduct has been the source of much political consternation. Options for the structure, which carries 110,000 vehicles per day, included either replacing it with a cut-and-cover tunnel, replacing it with another elevated highway, or eliminating it while improving other surface streets and public transportation. The current plan emerged in 2009 when government officials agreed to a deep-bore tunnel.