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 112 Scenic Byway that covers all of the route. The western end of the highway is also part of the Cape Flattery Tribal Scenic Byway, a state scenic byway that continues onto the Makah reservation to Neah Bay and Cape Flattery. The Washington State Transportation Commission also designated the section of SR 112 that lies west of SR 113 as the Korean Veterans Blue Star Memorial Highway in 2007 and the eastern half as the Vietnam Veterans Memorial Highway in 2008. SR 112 is maintained by the Washington State Department of Transportation (WSDOT), which conducts an annual survey on state highways