In late 2014, all eyes will be fixed on the dirt near Sixth Avenue North and Harrison Street. There, Bertha, the world’s largest-diameter tunneling machine, will emerge from the soils beneath Seattle. Our interactive simulation shows you how this area will change during construction.
Tunnel's north access contract awarded
Construction of new ramps that will connect the existing lanes of SR 99 to the north entrance of the future SR 99 tunnel will get underway this winter. We awarded the $41.6 million contract to Guy F. Atkinson Construction, LLC of Renton, Wash. in January 2015. The contract is nearly $4.5 million under our estimate.
The SR 99 North Access Connection Project will connect the SR 99 tunnel’s north entrance at Harrison Street to the existing roadway north of the Mercer Street bridge. It will also build new on- and off-ramps at Republican and Harrison streets, extend Sixth Avenue North between Harrison and Mercer streets, and improve water and sewer lines in the area.
Other construction in the area
As you've likely noticed, the north end is bustling with construction activity. In addition to tunnel construction, our partners at the City of Seattle are making great progress on the Mercer Corridor Project. We’re coordinating closely with their construction, and will continue to do so as we move forward.