TagSR509(108)
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2014-06-15Airport Key Map: Sea-Tac Airport Property Zones
★ 32This Airport Key Map, published by the Port of Seattle on June 15, 2014, provides a general reference overview of property zones surrounding Seattle-Tacoma International Airport. It identifies distinct areas including the Airfield, Terminal, Commercial, South of Airfield, South of 200th, and North of Airfield zones, and distinguishes between Port of Seattle property, lease boundaries, non-Port property, land available for redevelopment, and the proposed SR 509 corridor. The aerial photo, taken in Spring 2012, is intended for general reference only and is not approved for navigation use. -
2002-01-01SR 509: Corridor Completion/I-5/South Access Road revised draft environmental impact statement and draft Section 4(f) evaluation
★ 32This January 2002 Revised Draft Environmental Impact Statement evaluates proposed improvements to SR 509 and I-5 in southwest King County, Washington, including a freeway extension to enhance southern access to Seattle-Tacoma International Airport. The study, prepared jointly by the Federal Highway Administration, WSDOT, Port of Seattle, King County, and the Cities of SeaTac and Des Moines, examines three build alternatives and a no-action alternative, differing in their proximity to Des Moines Creek Park and the airport runway protection zone. The proposed SR 509 extension corridor would be a minimum of 200 feet wide to accommodate general purpose and high-occupancy vehicle lanes in each direction. -
2025-11-19Highline Forum Agenda: November 19, 2025 — Transportation Updates
The Highline Forum held its November 19, 2025 meeting at the City of SeaTac Council Chambers, hosted by the City of Des Moines, with a focus on transportation updates including presentations from WSDOT on the SR 509 project, Sound Transit, and a StART update from the Port of Seattle. The forum, co-chaired by Port of Seattle Commissioner Sam Cho, also covered local transportation roundtable discussions and planning for 2026 co-chair roles and meeting schedules. The 2026 meeting calendar lists six bimonthly sessions, with the first scheduled for January 28, 2026 at Port of Seattle's SEA Airport facility. -
2025-11-19
Highline Forum Agenda: November 19, 2025 — Transportation Updates
Agenda for the November 19, 2025 Highline Forum meeting hosted by the City of Des Moines, held in hybrid format at City of SeaTac Council Chambers and via Microsoft Teams. Topics include Transportation Updates. Presenters include Commissioner Sam Cho (Forum Co-Chair), SeaTac Mayor Mohamed Egal and City Manager Jonathan Young, John White (WSDOT SR-509 Program -
2025-11-19Puget Sound Gateway Program SR 509 Completion Project
WSDOT presentation on the Puget Sound Gateway Program, focusing on the SR 509 Completion Project. The program includes two projects (SR 167 and SR 509) to provide essential connections to the ports of Tacoma and Seattle, with various stages of construction progress. -
2025-09-30HCM Signalized Intersection Capacity Analysis: SR 509 SB Ramps, NB SR 509 Ramps, and Des Moines Way S at S 128th St — 2032 No Action PM Peak
This traffic engineering report analyzes three signalized intersections along S 128th Street near SR 509 in the Sea-Tac area under projected 2032 No Action conditions during the PM peak hour. The study finds that the SR 509 ramp intersections are operating well over capacity, with an Intersection Capacity Utilization of 104.6% and an ICU Level of Service G, while the Des Moines Way S intersection operates more acceptably at 63.3% ICU. Overall intersection control delays range from approximately 19 to 27 seconds, with most approaches functioning at Level of Service B or C. -
2025-09-30HCM Signalized Intersection Capacity Analysis: SR 509 SB Ramps, NB SR 509 Ramps, and Des Moines Way S at S 128th St — 2032 No Action PM Peak
This traffic engineering report analyzes three signalized intersections along S 128th Street near SR 509 in the Sea-Tac area under projected 2032 No Action conditions during the PM peak hour. The study finds that the SR 509 ramp intersections are operating well over capacity, with an Intersection Capacity Utilization of 104.6% and an ICU Level of Service G, while the Des Moines Way S intersection operates more acceptably at 63.3% ICU. Overall intersection control delays range from approximately 19 to 27 seconds, with most approaches functioning at Level of Service B or C. -
2025-01-01City of Burien 2025 Federal Agenda
The City of Burien's 2025 Federal Agenda outlines the city's lobbying priorities, including a strong focus on reducing the impact of Seattle-Tacoma International Airport on surrounding communities. Key airport-related goals include supporting the FAA Reauthorization Act to reduce airport noise and emissions, conducting a new SEA-TAC noise study, and securing funding from the Port of Seattle for airport-impacted communities. The agenda also addresses broader city priorities such as infrastructure funding, environmental initiatives, public safety, and housing policy. -
2024-12-11City of Burien Comment Letter on SAMP Draft Environmental Assessment
The City of Burien submitted formal comments in December 2024 arguing that the Port of Seattle's Sustainable Airport Master Plan (SAMP) for Sea-Tac International Airport contains serious flaws, including an unrealistically narrow study boundary that ignores noise and air pollution impacts on surrounding neighborhoods. The city contends that the plan fails to account for cumulative impacts such as the SR-509 highway extension, the 2008 opening of the airport's third runway, and emerging science on health risks from ultrafine particles and aircraft noise. Burien is calling for a full Environmental Impact Statement rather than the less rigorous Environmental Assessment currently underway. -
2024-11-14SR-509 Stage 2 Open House
WSDOT is hosting an open house on SR-509 Big Picture School 440 S 186th Street, Burien WA 98168