Rocky Butte is an extinct cinder cone butte in Portland, Oregon, United States.
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11 Facts About Rocky Butte
2.
The Rocky Butte has a calc-alkaline composition and consists of basaltic andesite with olivine phenocrysts.
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3.
Rocky Butte is a prominent, but isolated hill, with two volcanic vents.
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4.
The exposure of rock from the Troutdale Formation suggests that Rocky Butte erupted onto a topographically irregular surface and that this surface later underwent erosion.
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5.
At the summit of Rocky Butte, a rotating airway beacon was erected in 1929; though the beacon is still lit, it was officially decommissioned in the late 1960s.
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6.
Rocky Butte jail, completed in 1947, served as the major facility for male prisoners in Multnomah County, with a courtyard and recreation field.
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7.
The Multnomah County Detention Center was built in downtown Portland after Rocky Butte Jail was demolished in 1984 to make way for Interstate 205.
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8.
Rocky Butte basalt was used to build the Rocky Butte Tunnel as well as the nearby West Burnside and NW Cornell Road Tunnels, all of which were constructed by the mason R Curcio and his crew.
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9.
The summit of Rocky Butte is a Portland city park, Joseph Wood Hill Park, which covers 2.
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10.
Rocky Butte is a popular climbing destination in the Portland area, having been developed by climbers during the 1970s and 1980s.
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11.
Rocky Butte provides a variety of climbs including cracks, dihedrals, slab, vertical, and overhanging face routes.
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