 The road originally terminated in Oso, but was extended as a one-lane highway that was constructed from 1910 to 1912.The current route of SR 530 first appeared on a map around 1899, when a road following the North Fork of the Stillaguamish River ended east of Oso.A map published in 1911 showed a road traveling from Conway southeast past Stanwood and Arlington towards Oso and Darrington.