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Building a New

State Route 99

through Seattle

The Alaskan Way Viaduct, an elevated section of State Route 99 in Seattle,

was built in the 1950s, and decades of daily wear and tear have taken their

toll on the structure. Because of the viaduct’s age and vulnerability to

earthquakes, replacing it is critical to public safety.


he Alaskan Way Viaduct Replacement

Program includes projects led by the

Washington State Department of

Transportation, King County, the City of

Seattle and the Port of Seattle. The

Federal Highway Administration is

a partner in this effort.

Major elements of the program


• A two-mile-long tunnel beneath

downtown Seattle.

• A mile-long stretch of new high-

way that connects to the south

entrance of the tunnel, near

Seattle’s stadiums.

• A new overpass at the

south end of down-

town that allows traffic

to bypass train blockages near Seattle’s busiest port


• Demolition of the viaduct’s downtown waterfront

Spot the solitary worked in the middle of the picture to

see just how big this tunnel is - 17.5 m diameter.

Contractors World International Vol 7 No 4


Contractors World International