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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
EA published, channelization plans approved, design documentation approved, hydraulic report submitted for approval, environmental permits submitted, and PS&E 95% complete.
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Design Construction Impacts
Construction is anticipated to start summer of 2007 and be completed fall of 2008
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Environmental Impacts / Compliance
Three noise walls are being constructed, 1 acre of wetland impacts being mitigated with credits from the Springbrook wetland bank, Gilliam Creek impacts being mitigated on site with stream realignment and enhancements.
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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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