Cascadia, Oregon, is an unincorporated community that was established in 1892 on the South Santiam River, 23 km east of the current city of Sweet Home, in Linn County, Oregon. It was originally a stage stop on the Santiam Wagon Road, and then became a summer resort also known as Cascadia Mineral Springs. The resort had a hotel established by George Geisendorfer. The property was sold to the state in 1940 and now is the site of the 1.2 km2 Cascadia State Park.
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