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The 420-acre (170 ha), tree-lined main campus serves as an internationally recognized arboretum and the centerpiece of Corvallis, Oregon. The campus is 83 miles south of Portland, near the middle of the state's Willamette Valley. Much of the main campus was designed by landscape architect John Charles Olmsted in 1906. In 2008, Olmsted's early campus design was designated by the National Register of Historic Places as the Oregon State University Historic District. It is the only college or university campus in Oregon to hold a historic district designation. The Memorial Union was designed by OSU alum and renowned Oregon architect, Lee Arden Thomas. It has been recognized as "one of the finest examples of neoclassical architecture in Oregon."
=== OSU-Cascades (Bend) ===
In 2016 OSU completed the construction of a 10-acre branch campus in Bend. This campus is called OSU-Cascades and offers students living in Oregon's central region an opportunity to attend select classes closer to their homes.
As of 2023, …
