 In addition to State Road 2, State Road 23 was created in 1915, traveling north from Spokane to Newport, and was renumbered to State Road 6 in 1923.The Stevens Pass Highway was transferred to state maintenance in 1931 with the establishment of State Road 15, traveling from Everett to Peshastin.The United States Highway System was adopted on November 11, 1926, and designated US 10 on the future route of US 2 from Peshastin to Spokane and US 195 from Spokane to Newport.