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Project Title & Location
SR 518-Sea-Tac airport to I-5/I-405 interchange, in Tukwila
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Project Description
This project will improve existing mobility and safety as well as accommodate projected airport traffic by adding a third eastbound lane between the North Airport Expressway and the I-5/I-405 interchange.
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Contractor/Consultant
Consultants working on the SR 518 project include; Parsons Brinkerhoff, EnviroIssues, HWA, Lin & Associates, Heidi Stramm, The Resource Group, DEA Engineers, Herrera and Geoff Baillie and Associates.
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Recent Progress
Held a Value Engineering Study January 2006, completed the draft channelization plans and deviations, begun work on the hydraulics design
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Design Construction Impacts
The December 2005 Cost Estimate Validation Process (CEVP) estimates a construction duration of 18 to 24 months with a construction start the summer of 2007 .
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Environmental Impacts / Compliance
Environmental Impacts and mitigation to be determined as part of the EA process.
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Impacts to Traffic
When completed the SR 518 project will reduce congestion on eastbound SR 518 and the North Airport Expressway and eliminate the difficult merge from the North Airport Expressway and SR 99 to eastbound SR 518.
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