 The eastern section of the road was constructed in 1887 and was connected to Camano Island by a cable ferry, which was replaced by a bridge opened in 1909.The highway was paved in 1916 and acquired by the state government in 1945, becoming Secondary State Highway 1Y (SSH 1Y).The state funded new bridges across the Stillaguamish River and Davis Slough and later renumbered the highway as SR 532 in 1964, a few years before the highway was moved to a new roadway.