New SR 99 off-ramp construction starts this summer
Construction will soon begin on a new flyover off-ramp designed to connect the northbound lanes of State Route 99 to Seattle’s stadiums, Pioneer Square and downtown Seattle.
The Washington State Department of Transportation awarded the $3.56 million contract to Interwest Construction, Inc. of Burlington, Wash., to build the ramp to South Dearborn Street, which will allow northbound traffic to exit in Seattle’s SODO neighborhood when the new SR 99 tunnel opens. The ramp will be built within the existing SR 99 work zone near the stadiums, so it should not have much effect on drivers in the area.
WSDOT and Interwest expect to sign a contract giving notice to proceed in the coming weeks. Construction activities are expected to start in July and last approximately six months. The new off-ramp will open to motorists at the same time as the new SR 99 tunnel, currently scheduled for 2018.