Santiam Junction is a highway junction and unincorporated community in Linn County, Oregon, United States, at the intersection of U.S. Route 20/Oregon Route 126 and Oregon Route 22. According to the Oregon Department of Transportation, the elevation is 3,750 feet (1,143 m). An automated weather station is located here, as well as highway maintenance facilities. The Santiam Junction State Airport is an emergency/recreational landing strip that is closed from the first snowfall until spring. The airport grounds permit fly-in camping.