Skip to main content

SR-99 Tunnel North Access Connection

SR-99 Tunnel North Access Connection

Part of the Alaskan Way Viaduct Replacement Program
Location
Seattle, Washington
Client
Washington State Department of Transportation
Designer
Washington State Department of Transportation
Contract Value
$41,600,000
Completion Date
2016
Market Sector
Roadways & Bridges
Capabilities
Self Performance
The Washington State Department of Transportation awarded a $41.6 million contract to Atkinson for the SR-99 Tunnel North Access Connection project.
 
As part of the Alaskan Way Viaduct replacement program, the Atkinson team will construct the SR-99 tunnel’s north access entrance and exit roadways from the portal structure at Harrison Street to north of the Mercer Street bridge. The team also will build on- and off-ramps at Republican and Harrison streets and extend Sixth Avenue North from Harrison Street to Mercer Street.
 
Once the new roadways and bridges are complete, the team will demolish the existing SR-99 bridge over Broad Street and bring the abandoned Broad Street retained cut alignment up to grade. As part of their scope, the team also will install traffic signal, illumination, and ITS systems, and relocate existing utilities, including water, storm, sewer, and high voltage electrical systems.

Related Projects