 Serving the communities of Arlington, Arlington Heights, Oso, Darrington and Rockport, the roadway travels parallel to a fork of the Stillaguamish River from Arlington to Darrington, the Sauk River from Darrington to Rockport and the Whitehorse Trail from Arlington to Darrington.The first segment of SR 530 to appear on a map was a road extending from Arlington to Oso in 1899.The first segment to be state-maintained was (SSH 1E), which ran from Conway to Arlington.