Routes along Seattle's completed waterfront
Projects led by WSDOT and the City of Seattle will together transform how drivers use SR 99 to travel through Seattle. The new SR 99 tunnel is designed to work in conjunction with a new Alaskan Way surface street that the City of Seattle will build along the waterfront after the viaduct is demolished.
The map below shows how some common trips will look when the tunnel is open, the demolition project is complete, and Waterfront Seattle has completed the new Alaskan Way.
The SR 99 tunnel will provide a direct route on SR 99 between the stadiums and Seattle Center. It is designed to accommodate the current volume of viaduct traffic that today does not use any of the mid-viaduct ramps.
When work is complete, the traffic that today uses the viaduct’s mid-town ramps to enter or leave downtown can instead use the new Alaskan Way surface street. Waterfront Seattle's work includes a road above the waterfront railroad tracks to connect Elliott and Western avenues with Alaskan Way, avoiding a railroad crossing. Visit the Waterfront Seattle website for more information about the design of these elements.
At the tunnel’s north end, three roads currently interrupted by SR 99 (John, Thomas and Harrison streets) will be reconnected, improving east-west connections between South Lake Union and Uptown.
These new route options will make some current trips shorter and other trips a little longer, while improving safety for the travelling public by replacing the viaduct with a tunnel built to modern safety and earthquake standards.