Building the north portal
Significant construction continues at the SR 99 tunnel’s future north portal. This is the spot where Bertha, the SR 99 tunneling machine, will emerge at the end of her two-mile journey beneath downtown Seattle. As part of this project, Harrison, Thomas and John streets will be reconnected to provide additional east-to-west connections once the tunnel opens.
Below is a rendering of how the future SR 99 will connect to the surrounding surface streets.
Preparing for Bertha and future traffic
Click through the slider below for photos of work happening around the north portal of the tunnel.
Other ongoing work
- Crews are continuing ongoing utility work near Taylor Avenue North, installing traffic signals on Harrison Street at SR 99 and placing overhead signs on southbound SR 99 approaching the tunnel. Note that these signals and signs will remain covered and not activated until the tunnel opens.