TagWSDOT(123)

This 2019 WSDOT report analyzes noise barriers along the SR509 Phase 1 highway alignment near the Sea-Tac area, evaluating whether proposed sound walls meet feasibility and cost-reasonableness standards. Wall 3 was rejected because it could not achieve the required 5 dB noise reduction for nearby residents. Wall 4 met the technical noise-reduction threshold but was ultimately rejected because its estimated cost of $111,478 exceeded the allowable budget of $72,254.

The Highline Forum held its September 26, 2018 meeting in Normandy Park, focusing on SR 509 and SR 518 transportation projects alongside Seattle-Tacoma International Airport-related topics. The agenda included updates on the Sustainable Airport Master Plan, the StART (Sea-Tac Airport Roundtable) community engagement program, and airport noise programs, presented by Port of Seattle officials. Infrastructure improvements in Normandy Park and a WSDOT briefing on regional highway gateway projects were also on the agenda.

The Puget Sound Gateway Program, presented at a Highline Forum in September 2018, outlines two highway completion projects—SR 509 in King County and SR 167 in Pierce County—designed to improve freight movement between the ports of Seattle and Tacoma and key distribution centers. Among its key benefits, the program includes a new south access point to Sea-Tac Airport and aims to reduce congestion on local roads surrounding the airport. Funding for the program combines state, local, federal, and toll revenue sources, with electronic tolling on all new lanes expected to begin as early as 2025.

This 2018 interlocal agreement between the City of Des Moines and the Port of Seattle outlines a cost-sharing arrangement for street improvements along South 216th Street, adjacent to the Des Moines Creek West (DMC-W) property near Sea-Tac Airport. The Port agreed to pay $1.5 million toward road upgrades accommodating pedestrians, cyclists, transit, and freight, with that payment credited against any future transportation impact fees tied to DMC-W development. The agreement also sets the stage for long-term ground leasing and commercial development of the approximately 20-acre DMC-W site to generate jobs and revenue for both parties.

The City of SeaTac entered into an interlocal agreement (Agreement No. 18-A144) with the Washington State Department of Transportation (WSDOT) to provide up to $4,000,000 in local matching funds for the construction of the Puget Sound Gateway Program, specifically the State Route 509 Extension Project. The funding is split into two stages: up to $2,000,000 in real estate and/or cash for the SeaTac Access Local Nexus Project, and up to $2,000,000 in cash toward the South 188th Street Interchange once construction sales tax is received. WSDOT is responsible for designing, constructing, and managing the project, which includes improvements such as interchange ramps and access roads largely within the City of SeaTac.

In November 2017, the Washington State Department of Transportation (WSDOT) notified the Des Moines City Council that a parcel of surplus state-owned property was being transferred at market value to the Port of Seattle. The notice was issued in compliance with RCW 47.12.055 and RCW 43.17.400, which require a 60-day waiting period before such property transfers can be completed. The city was invited to request additional information or waive the waiting period in writing to allow the transfer to proceed without delay.

Joint Transportation Committee 09/17

This 2017 Noise Technical Report, prepared by The Greenbusch Group for the Washington State Department of Transportation, evaluates the noise impacts of Phase 1 of the SR 509 Completion Project near Seattle-Tacoma International Airport. It compares the proposed highway improvements against a 2003 environmental impact study, assessing changes in noise levels, affected residents, and noise abatement measures such as sound walls. The report concludes with recommendations for minimizing construction and long-term traffic noise impacts on surrounding communities.

A July 2017 presentation by the Washington State Department of Transportation outlines the Puget Sound Gateway Program's SR 509 Completion Project, which aims to build new freeway connections linking the region's major ports and Seattle-Tacoma International Airport to surrounding communities and Eastern Washington. The project includes plans for tolling to help fund construction and is intended to improve freight movement, airport access for passengers and air cargo, and regional economic development.

The Washington Aviation System Plan (WASP), completed in July 2017 by the Washington State Department of Transportation (WSDOT), is a statewide assessment of Washington's public-use airports covering both commercial and general aviation facilities. The plan evaluates how individual airports perform and interact as a system, identifies needed improvements, and develops policy recommendations to support communities, economic activity, and emergency services across the state. Funding was provided by the Federal Aviation Administration (FAA), and the plan builds on the earlier 2009 Long-term Air Transportation Study (LATS).