The Port of Seattle is seeking authorization to enter into a 20-year Interlocal Agreement with the Cities of Des Moines and SeaTac to continue the Des Moines Creek Basin Plan, which manages drainage, flooding, erosion, fish habitat, and water quality issues near Seattle-Tacoma International Airport. The Port would contribute $89,304 per year, covering ongoing operation and maintenance, habitat monitoring, and infrastructure improvements for facilities such as the Regional Detention Facility and High Flow Bypass Pipeline. This cooperative regional effort reduces costs for all parties and supports the airport's stormwater management and environmental compliance obligations.Open full document
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Commission agenda memorandum requesting authorization for the Executive Director to execute the 5th Interlocal Agreement (ILA V) with the Cities of Des Moines and SeaTac for continuation of the Des Moines Creek Basin Plan for 20 years at $89,304 per year. The agreement covers ongoing operation and maintenance, capital replacement and improvement, project monitoring, invasive vegetation control, and education and outreach activities. The Port’s contribution is based on its 37.21% share of impervious surfaces within the basin.