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Seattle's Alaska Way Viaduct Replacement Project — Update

from Washington State Department of Transportation

Seattle Tunnel Partners has paused mining to begin planned maintenance on Bertha, the SR 99 tunneling machine. Crews stopped tunneling approximately 190 feet beneath First Avenue, just north of Pike Street, on Tuesday, Oct. 4. STP chose the location of the stop in advance because dense soils in the area are suitable for hyperbaric work. more

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