 The Stevens Pass Highway was opened on July 11, 1925, and traveled from Everett along the Skykomish River and over Stevens Pass towards Leavenworth.The highway was transferred to state maintenance from the Department of Highways in 1931 as State Road 15.The United States Highway System was adopted by the American Association of State Highway Officials (AASHO) on November 11, 1926, and included a shorter US 2, traveling from Bonners Ferry, Idaho to the Upper Peninsula of Michigan, and several routes along the modern route of US 2 in Washington.