Routes along Seattle's completed waterfront
Projects led by WSDOT and the City of Seattle are together transforming how drivers use SR 99 to travel to and 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 is building along the waterfront in the footprint of the demolished viaduct.
The map below shows how some common trips will look when all projects are complete along Seattle's central waterfront.
The SR 99 tunnel provides a direct route on SR 99 between the stadiums and the Space Needle. It is designed to accommodate the percent of viaduct traffic that did not use any of the old mid-viaduct ramps.
When the new Alaskan Way is complete, the vehicles that once used 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 long 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 and Battery Street Tunnel with a new tunnel built to modern safety and earthquake standards.