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Northwest Marine Terminal Association A voluntary association of deepwater ports and marine terminal operators in Oregon and Washington. Information The Northwest Marine Terminal Association NWMTA is a voluntary association of deepwater ports and marine terminal operators in Oregon and Washington. Current NWMTA members include the ports of Anacortes Astoria Bellingham Coos Bay Everett Grays Harbor Kalama Longview Northwest Seaport Alliance Olympia Pasco Port Angeles Portland Seattle Columbia County and Vancouver USA. Since 1939 the Northwest Marine Terminal Association has collaborated on trade issues and economic development.