Santiam State Forest is one of six state forests managed by the Oregon Department of Forestry. The forest is located approximately 25 miles (40 km) southeast of Salem, Oregon, and includes 47,871 acres (193.73 km²) on the western slope of the Cascade Mountains in three Oregon counties: Clackamas, Linn, and Marion. It is bounded on the east by the Willamette National Forest and Mount Hood National Forest. Silver Falls State Park is located west of the forest. The rest of the land surrounding the forest belongs to the Bureau of Land Management or is privately owned. The forest is managed as part of the Department of Forestry's North Cascade District.