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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 provides improvement of SR 518 by widening lanes and
shoulders; widening a bridge; building retaining and noise walls;
removing and replacing sign bridges; installing bridge rail; concrete
barrier; guardrail; drainage items, and installing water quality systems.
The SR 518 Westbound transition from freeway to city streets will be planted.
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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
Draft Environmental Assessment (EA) has been completed and roadway and drainage design has begun. Received approval from the Corps of Engineers to seek out of basin mitigation sites for potential wetland impacts.
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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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