![]() ![]() The Columbia River flows west from the eastern Portland region, merging with the Willamette near Portland before moving north. The Willamette Valley is separated within by hills reaching heights more than 1,000 feet (300 m), and it is also physically separated from the lower Columbia River valley. With a variable topography, the Portland area ranges from river valley floors to terraces reaching elevations of 400 feet (120 m). It is surrounded on almost all sides by the Portland Delta. National Geodetic Survey, Rocky Butte has an elevation of 613 feet (187 m). It is one of the few smaller volcanic cones within or near Portland, along with Mount Tabor, Kelly Butte, and Powell Butte. Rocky Butte lies in the northeast part of Portland within the city limits, in Multnomah County, part of the U. Geography Downtown Portland as seen from Rocky Butte ![]() Located next to Interstate 205, the Butte is a popular destination for hiking, climbing, and seeing mountains from its summit viewpoint. The slopes of Rocky Butte currently support Joseph Wood Hill Park and the Rocky Butte Natural Area, which includes a wide variety of flora and fauna and supports rich forest stands. Historically, the mountain was the home of the Rocky Butte Jail, Judson Baptist College, and Hill Military Academy, as well as an extensive Works Progress Administration construction project it is also the site of a still functioning but decommissioned airway beacon, Portland Bible College, and a campus for the City Bible Church. The Butte has a calc-alkaline composition and consists of basaltic andesite with olivine phenocrysts. It was produced by the subduction of the oceanic Juan de Fuca tectonic plate under the North American tectonic plate it is the core remnant of intrusive rock from kilate Pleistocene volcano. The volcano erupted between 285,000 and 500,000 years ago.Īs part of the Boring Lava Field, Rocky Butte is considered an outlier of the Cascade Range. It is also part of the Boring Lava Field, a group of volcanic vents and lava flows throughout Oregon and Washington state. Rocky Butte (previously known as Mowich Illahee and Wiberg Butte) is an extinct cinder cone butte in Portland, Oregon, United States. ![]()
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