This WSDOT Puget Sound Gateway Program document presents preliminary design plans for a new SR 509 expressway segment running from 24th Ave S to S 188th St through the Blueberry Lane neighborhood, spanning the cities of Des Moines and SeaTac. The plans show proposed roadway construction, stormwater treatment ponds, wetland areas, and several buildings and roads slated for demolition to accommodate the new highway alignment. Cross-sectional diagrams illustrate the elevation changes and right-of-way boundaries relative to existing neighborhoods, trails, and local streets.Open full document
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WSDOT Puget Sound Gateway Program planning documents for the SR 509 new expressway project through the Blueberry Lane neighborhood between Des Moines and SeaTac. The documents include an aerial plan view showing proposed roadway alignment, wetlands, stormwater treatment ponds, demolition areas, and new sidewalk/driveway construction. Three cross-sectional drawings (A-A, B-B, C-C) illustrate the existing ground profile relative to the proposed SR 509 centerline and WSDOT right-of-way limits.