Using the new SR 99 tunnel

Seattle's new SR 99 tunnel

Seattle’s newest tunnel provides 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 features modern safety and operations systems.

Know your new tunnel:

  • 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
  • Currently toll-free; tolling will start as soon as summer 2019
  • Learn how freight routes change with the new SR 99 tunnel

Using the tunnel video series

We produced four new videos to help drivers navigate the changes the new tunnel brings. The videos are also available in Spanish and Chinese. Explore the videos below:

Driving north to and through Seattle
Driving north on SR 99 to get to the tunnel or downtown Seattle.
Driving south to and through Seattle
Driving south on SR 99 to get to the tunnel or downtown Seattle.
Getting to northbound SR 99 from downtown Seattle
Getting onto SR 99 northbound from downtown Seattle.
Driving south to and through Seattle
Getting onto SR 99 southbound from downtown Seattle.

New intersections at the tunnel's north and south end

With new on- and off-ramps come new intersections. Our web post explains how intersections by the stadiums and the Space Needle have changed.

+ South portal near the stadiums

+ North portal near Seattle Center

+ Inside the tunnel