August 20, 2025August 10, 2026

Programmatic Environmental Checklist: Seattle-Tacoma International Airport Flight Corridor Management Program

Notes

Port of Seattle SEPA File No. 2025-05, programmatic environmental checklist prepared August 20, 2025 for the Sea-Tac Airport Flight Corridor Management Program. Documents the FAA-mandated tree obstruction removal program required under 49 U.S.C. Subtitle VII and 14 CFR Part 139 for SEA’s three parallel runways. Covers four obstruction categories — current obstructions, incidental trees, future obstructions in critical areas, and NAVAID obstructions — with approximately five-year implementation cycles (2016, 2019, 2025). Contact: Steve Rybolt, Senior Environmental Program Manager, Port of Seattle.

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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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