Tunnel to replace Alaskan Way Viaduct, Seattle, US

The central waterfront portion of the Alaskan Way Viaduct and Seawall is to be replaced with a US$ 1.9 billion tunnel. The 1.7 mile-long (2.74 km) bored tunnel - expected to be a stacked tube with two lanes in each direction, will cost just under US$ 2 billion. The total cost of the project is US$ 4.24 billion. This includes the entire viaduct corridor - over 2 miles (3.22 km), a surface street, a new seawall in the central waterfront, utility relocation, city streets and transit pathways, transit infrastructure, construction transit service and all prior program expenditures Video: Washington State Department of Transport (WSDOT)