Using the new SR 99 tunnel

Seattle's new SR 99 tunnel

Seattle’s newest tunnel will provide a direct route on SR 99 between the stadiums and the Space Needle. It is the largest double-deck highway tunnel of its kind in the country, and will feature modern safety and operations systems.

Know your new tunnel:

  • Opens early 2019
  • Two miles long
  • Two lanes in each direction, plus an eight-foot safety shoulder
  • South portal near stadiums; north portal near Space Needle
  • No mid-tunnel exits or entrances
  • Will open toll-free for a period of time; tolling starts on a date to be determined

Drivers that today use the Alaskan Way Viaduct or Battery Street Tunnel will have new routes and options for getting to and through downtown Seattle.

Tunnel route with nearby surface street options

This map shows the tunnel's path beneath downtown Seattle and major surface street options that can take you to and from both ends of the tunnel (the portals).

Map of downtown Seattle showing SR 99 tunnel and nearby surface street routes
Click map for larger PDF version

Drivers will be able to get on and off SR 99 at both tunnel portals, and decide whether to take the tunnel or enter downtown and adjacent neighborhoods.

+ South portal near the stadiums

+ North portal near Seattle Center

+ Inside the tunnel