November 1, 1997August 1, 2026

Des Moines Creek Basin Plan

The 1997 Des Moines Creek Basin Plan is a collaborative watershed management document produced by the City of SeaTac, City of Des Moines, Port of Seattle, and King County. It addresses stormwater, drainage, and environmental conditions within the Des Moines Creek basin, an area significantly influenced by Sea-Tac Airport and surrounding urban development. The plan establishes coordinated strategies among the four jurisdictions to manage water quality and flooding in this shared watershed.

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The 1997 Des Moines Creek Basin Plan is a collaborative planning document produced by the Des Moines Creek Basin Committee, comprising the City of SeaTac, City of Des Moines, Port of Seattle, and King County. The plan addresses stormwater, water quality, and land use issues within the Des Moines Creek watershed. The cover includes a map showing the basin area in relation to Sea-Tac Airport, Angle Lake, Puget Sound, and surrounding roadways.

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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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