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  • SR-509 Stage 2 2022_07_12_RM_10b_Presentation_Des-Moines-Creek-West-Ground-Lease

    Aerial marketing map depicting a 19.8-acre Business Park (B-P) zoned property in Des Moines, Washington, located adjacent to the Des Moines Creek Business Park and near Seattle-Tacoma International Airport (SEA). The map highlights the SR-509 Extension corridor, Angle Lake Station, the newly constructed 24th-to-28th Street connection, and proximity to Interstate 5 and Highway 99.

  • Barnes Creek Trail Mitigation Transportation Committee 09 Jun 2022 Agenda Pdf

    A Washington State Department of Transportation (WSDOT) presentation slide labeled 'Barnes Creek Mitigation Site – Stage 2' showing a draft conceptual restoration plan map for Barnes Creek Wetland Mitigation, part of the Puget Sound Gateway Program SR 509/24th Ave. S. to S. 188th St. New Expressway Project. The slide notes WSDOT is avoiding steep slope areas and identifies three potential site access points at South 223rd Street, South 222nd Street, and South 220th Street.

  • Resized-SR-509-map

    This map depicts the Washington State SR-509 extension project, showing three construction stages: Stage 1a (at Toll Point near S 208th St), Stage 1b (along I-5 through Kent), and Stage 2 (connecting Burien via Des Moines Memorial Drive to the existing Lake to Sound Trail). The map also identifies future Sound Transit stations, Barnes Creek Wetland mitigation, the Des Moines Creek Trail, and the Lake to Sound Trail under construction near Sea-Tac Airport.
  • FAA SPL V2 HR Trim
    2022-03-29

    Fundamentals of Noise and Sound | Federal Aviation Administration

    Noise Metrics Noise Contours Sound is energy transferred through the air that our ears detect as small changes in air pressure. The more energy put into making a sound, the louder it will be. Try whispering. Then yell. You can feel how much more energy goes into yelling. Noise is sound that is unwanted. Some

  • SR-509 Stage 2 Des Moines Creek Park

    A WSDOT aerial planning map dated 11/6/2021 showing the proposed SR 509 New Expressway alignment (red lines) relative to Des Moines Creek Trail Park, with project boundaries (dashed black lines), wetland areas, contour elevations, and adjacent features including an Amazon Warehouse and the City of SeaTac boundary. The document is labeled 'For Discussion Purposes Only' and is part of the Puget Sound Gateway Program involving SR 509, I-5, and SR 167.

  • SR509 Stages Map

    A project staging map shows the SR 509 extension and I-5 connector route divided into Stage 1a (toll point near Des Moines Memorial Drive), Stage 1b (along Military Road S toward Kent), and Stage 2 (extending northwest toward Burien and southeast toward Kent via SR 99). The map covers the Des Moines, SeaTac, Burien, and Kent areas of Washington State, with route numbers 99, 509, 316, and 5 visible.

  • North SeaTac Park Lease Map

  • 2022-01-01

    Des Moines Memorial Drive S at SeaTac City Boundary — Google Earth Street View

    Google Earth street-view image (© 2022 Google / Maxar Technologies) looking north along Des Moines Memorial Drive S at the signalized intersection marking the SeaTac city boundary, as indicated by the visible 'Welcome to SeaTac' city sign on the right. A Google My Maps overlay labels nearby points of interest including Chevron, Des Moines Memorial Drive Park, and Transform Burien, in the context of a Sea-Tac Airport mapping project.
  • 2021-12-20

    SR 509/24th Ave S to S 188th St new expressway project: Blueberry Lane neighborhood

    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.
  • 2021-11-04

    SR 509/24th Ave S to S 188th St new expressway project: Des Moines Creek Park

    This WSDOT discussion document from November 2021 shows a planning map for the SR 509 Puget Sound Gateway Program's new expressway project, spanning from 24th Ave S to S 188th St near Des Moines Creek Park in the City of SeaTac. The map highlights the proposed highway alignment (shown in red) running adjacent to Des Moines Creek Trail Park, identifying wetland areas, contour elevations, and nearby features such as an Amazon warehouse and the Lake to Sound Trail. The project represents a major infrastructure expansion in the SeaTac area that would affect the Des Moines Creek Park corridor and surrounding natural resources.