Items Tagged with 'Seattle Tunnel Partners'

The stripes in the new State Route 99 tunnel in Seattle signify the near completion of the multi-year construction project.

The last of 1,152 precast road panels for the lower deck of Seattle’s SR 99 tunnel was set into place on March 27, completing the 1.7-mile tube’s double-decked roadways.

It took 80-ft-deep, dense soil for “Bertha,” the world’s largest-diameter tunnel-boring machine, to finally hit her stride.

Bertha, the world’s largest-diameter tunnel-boring machine, sits at a low point in its 9,000-ft bore under downtown Seattle.