This U.S. Army Corps of Engineers permit (No. 1996-4-02325) authorized the Port of Seattle to construct a third runway at Seattle-Tacoma International Airport, allowing permanent impacts to nearly 20 acres of wetlands and the filling or relocation of up to 980 linear feet of Miller Creek. The permit required the Port to implement a detailed Natural Resource Mitigation Plan, including wetland restoration projects at multiple sites such as Auburn, Vacca Farm, and Tyee Valley Golf Course, monitored over a 15-year period. Additional conditions mandated stormwater quality controls, water toxicity testing, and regular compliance reporting to the Corps of Engineers.Open full document
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This Department of the Army permit authorizes the Port of Seattle to permanently impact 19.62 acres of wetlands and temporarily impact additional wetlands for construction of an 8,500-foot third runway and associated facilities at Seattle-Tacoma International Airport. The permit covers impacts to Miller Creek, Walker Creek, and Des Moines Creek watersheds, including up to 980 linear feet of Miller Creek fill and relocation. Special conditions include stormwater management requirements, water quality monitoring, and implementation of a 15-year Natural Resource Mitigation Plan.