Seattle’s Alaskan Way Viaduct was seismically unsafe, leading to one of the city’s most ambitious projects: the Bertha tunnel. Learn how the project was planned, the challenges faced ...

A portion of Seattle's Alaskan Way Viaduct is being replaced by a deep tunnel, and the machine purpose-built for the job is the world's largest tunnel boring machine (TBM), christened "Bertha." ...

Glacier Northwest also said its soil handling took place outside WSDOT’s tunneling site, and its role was to fulfill its $28.3 million contract with private Seattle Tunnel Partners firms ...

That estimate is based on the 3.2 kilometre, $3.3-billion US State Route 99 Tunnel that was finished in Seattle, Washington in 2019. But the price of the 401 tunnel is likely much higher ...

An curved arrow pointing right. When Seattle decided to put in a new highway tunnel beneath the city, a machine was specially built to dig the 2-mile long, 57-foot wide project. The 6,700 ton ...

Bob Ferguson and the state Department of Labor & Industries announced Tuesday that Highway 99 tunnel subcontractor ... it underpaid for work on the Seattle tunnel project. The 46 employees who ...

Washington State Department of Transportation will implement a toll as drivers make their way through the tunnel... The second phase of the Seattle Squeeze is winding down but that doesn’t mean ...

That tunnel vote has been fodder for spirited talk ’round Seattle Mag World Headquarters of late (though it’s curiously quiet today). But it’s less about which camp you’re tunneled into (dig it or ...

Seattle-area voters, tired of long commute times ... expense to general contractor JCM Northlink LLC to handle the tunnel segment. JCM is a joint venture formed in 2013 between Jay Dee Contractors ...

Federal investigators say a series of chain-reaction crashes and a fire in a Wyoming highway tunnel that killed three people ...