Pacific Highway (United States) from the Hudson's Bay Company were the first non-Native Americans to use the route of the future Pacific Highway to move between today's Washington State and "Alta California." During the second half of the 19th Century, mule trains, stagecoaches, and the Central Pacific Railroad also followed the route of the Siskiyou Trail. In the early 20th century, around 1910, entrepreneur Sam Hill lobbied the governments of Washington and Oregon to build automobile roads along the path of the Siskiyou Trail, with the ultimate goal of building a paved auto route from Canada to Mexico. Pacific Highway (United States) Pacific Highway
Washington State Route 529 1913, the Pacific Highway was added to the state highway system and used Broadway (former SR 529) in Everett and State Avenue in Marysville to travel between Seattle and the Canada–US border. The Pacific Highway between Everett and Marysville, named the Vernon Road, was paved in 1916 and paid by a county road bond issue. The highway was later signed as in 1923, which became the Washington segment of (US 99) during the creation of the United States Numbered Highways in 1926. Since the bridges over the Snohomish River delta weren't complete at the time of planning, US 99 used