The Santiam Wagon Road, a toll road connecting the Willamette Valley with central Oregon, was opened in 1865. The road extended from the Sweet Home Valley across the Santiam Pass in the Cascades to Camp Polk near Sisters. The Santiam Wagon Road was a vital means of supplying livestock and goods from western Oregon to central Oregon and transporting wool from east of the Cascades back to Willamette Valley woolen mills. Competition with railroads that extended south from the Columbia River into central Oregon and the newly opened McKenzie Pass Highway made the wagon road obsolete by the late 1930s. U.S. Route 20 was constructed across much of the same route as the Santiam Wagon Road.