 The highway's interchange with Interstate 5 west of Arlington was opened to traffic on September 28, 1965.On December 26, 1980, SR 530 was closed between Stanwood and Silvana due to a flood that caused the Stillaguamish River to overflow from its banks, which the highway parallels.The roadway was extended north from Darrington to in Rockport, making the highway a total of and both termini being in Skagit County.