TagSR509(79)
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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. -
2025-11-19Puget 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. -
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 -
2024-09-02Interlocal agreement between WSDOT and City of SeaTac
This interlocal agreement between the Washington State Department of Transportation (WSDOT) and the City of SeaTac outlines a cooperative arrangement for road improvements on S. 204th Street between 32nd and 34th Avenues South, as part of the SR 509 Completion Project near Sea-Tac International Airport. WSDOT agreed to assign the construction work in that corridor to the City of SeaTac and reimburse the city up to $1,641,318 upon substantial completion. After construction, the City of SeaTac is responsible for maintaining all improvements, including sidewalks, lighting, and stormwater facilities. -
2024-02-05Briefing of SR 509 project and presentation of memorandum of understanding (MOU) with Washington State Department of Transportation (WSDOT)
The City of Burien and the Washington State Department of Transportation (WSDOT) have entered into a Memorandum of Understanding regarding the SR 509 Completion Project Stage 2, which extends the highway from S 188th Street to 24th Avenue South, with portions running through Burien's city limits. The project includes construction of a shared-use path, two roundabouts on S 160th Street, and short noise wall segments adjacent to highway on-ramps. WSDOT is responsible for costs associated with the proposed design and construction, while Burien bears costs for any changes it requests beyond standard design requirements. -
2023-12-07SR 509 Completion Project: 24th Ave. S. to S. 160th St.
The SR 509 Completion Project extends State Route 509 from 24th Avenue South to South 160th Street near Sea-Tac Airport, adding new interchanges, roundabouts, and connections to southbound I-5 and toward Seattle. Key features include a new interchange at South 188th Street with a shared-use path and Lake to Sound Trail access, as well as a South 160th Street interchange with noise walls to protect nearby residents. The project also includes wetland mitigation sites and infrastructure improvements along the Des Moines Memorial Drive corridor. -
2023-12-05SR 509 project completion
https://wsdot.wa.gov/construction-planning/search-projects/sr-509-completion-project -
Tribes call for national ban on salmon-killing chemical in car tires
by John Ryan Three Northwest tribes have petitioned the federal government to ban a salmon-killing chemical found in tires and urban streams worldwide. As car and truck tires wear and leave behind skid marks and tire dust, the rubber stabilizer known as 6PPD turns into 6PPD-quinone (also called 6PPD-q), one of the most toxic substances -
2023-04-24Puget Sound Gateway Program: Phase 1, Stage 2 of the SR 509 Completion Project NEPA/SEPA Environmental Reevaluation form
South Access Road Section 4(f) -
Page 33 from SR-509-FEIS-ocr Alternative C2 (preferred)
This is Figure S-7 from the SR 509 Corridor Completion/I-5/South Access Road Environmental Impact Statement, showing the preferred Alternative C2 alignment. The aerial map depicts proposed SR 509 and South Access Road improvements near Sea-Tac International Airport, connecting to I-5 via Orillia Road, with key landmarks including Angle Lake, Runway 16L/34R, and surrounding streets in SeaTac, Washington, dated December 31, 2002.