The Alaskan Way Viaduct Replacement Program is led by the Washington State Department of Transportation in partnership with the Federal Highway Administration, King County, the City of Seattle and the Port of Seattle. Each jurisdiction is responsible for its own projects’ management, environmental work, design and construction.
The state is responsible for leading or funding 30 of the projects that will work together to reshape the SR 99 corridor. Construction on our first project started in 2007, when crews stabilized four viaduct columns that settled following the 2001 Nisqually Earthquake. Since then, 27 projects that are led or funded by the state have been completed.
State-led/funded improvements (last updated Feb. 2020)
- SR 99 Connections: This contract with Scarsella Brothers Inc. made the final connections between the tunnel’s portals and SR 99, necessary to open the tunnel to traffic.
- SR 99 Viaduct Demolition, Decommissioning and Surface Street Project: This contract includes the demolition of the viaduct, the decommissioning and filling of the Battery Street Tunnel, and the rebuilding and reconnecting of Seventh Avenue North (Aurora Avenue North) near the SR 99 tunnel's north portal. Work began in early 2019.
- South Access: Surface Street Connections: This project completes final surface street improvements around the SR 99 tunnel's south portal.
- Waterfront Seattle Construction: The City of Seattle’s Office of the Waterfront will build the new Alaskan Way street along the waterfront. Work began in mid-2019.