The SR 99 tunnel’s north portal is located just to the east of Seattle Center, near the intersection of Harrison Street and Sixth Avenue North. The final configuration of roads and ramps in this area will improve mobility through the neighborhood, especially east-west connections that were previously blocked by Aurora Avenue North and SR 99’s descent into the Battery Street Tunnel.
Ramps into and out of the tunnel
When the tunnel opens to vehicles, on- and off-ramps will provide access to and from SR 99. Below are renderings of the north portal’s final configuration:
A reconnected street grid
Work occurring after the tunnel opens to traffic will reconnect the street grid just south of the tunnel portal. Harrison, Thomas and John streets will be reconnected via three blocks of rebuilt Aurora Avenue North. The final street grid will look like this: