Tunnel's north access contract awarded
Construction of new ramps that will connect the existing lanes of SR 99 to the north entrance of the future SR 99 tunnel will get underway this winter.
The Washington State Department of Transportation awarded the $41.6 million contract to Guy F. Atkinson Construction, LLC of Renton, Wash. The contract is nearly $4.5 million under WSDOT’s estimate.
The SR 99 North Access Connection Project will connect the SR 99 tunnel’s north entrance at Harrison Street to the existing roadway north of the Mercer Street bridge. It will also build new on- and off-ramps at Republican and Harrison streets, extend Sixth Avenue North between Harrison and Mercer streets, and improve water and sewer lines in the area.
There is already heavy construction in the neighborhood. Our tunnel contractor, Seattle Tunnel Partners, is building the tunnel’s north entrance and the Seattle Department of Transportation is building the new Mercer Corridor. We will work closely with our partner agencies to minimize impacts on the traveling public. Visit our interactive map of the north access project to see how construction will progress.