|Elevation||5,023 ft (1,531 m) NAVD 88|
|Prominence||509 ft (155 m) |
|Topo map||USGS Lava Butte|
|Age of rock||About 7,000 years|
|Mountain type||Cinder cone|
|Last eruption||About 7,000 years ago|
Lava Butte is a cinder cone located in central Oregon, USA, just west of US Highway 97 between the towns of Bend, Oregon, and Sunriver, Oregon. It is part of a system of small cinder cones on the northwest flank of Newberry Volcano, a massive shield volcano which rises to the southeast. The cinder cone is capped by a crater which extends about 60 feet (20 m) deep beneath its south rim, and 160 feet (50 m) deep from the 5,020-foot (1,530 m) summit on its north side. Lava Butte is part of the Newberry National Volcanic Monument.
Like the other cinder cones in the area, Lava Butte only experienced a single eruption, dated by geologists in 1977 to 6,150 carbon-14 years, equivalent to about 7,000 years ago. The eruption began with a fissure spewing hot cinders to form the cone. In the next phase, a river of hot basalt flowed from the base of the small volcano to cover a large area to the west with a lava flow which remains largely free of vegetation. The lava flows reached the Deschutes River about 2.5 miles (4.0 km) to the west of the cone, burying its former channel under over 100 feet (30 m) of lava and damming the river to form a lake, known as Lake Benham. The river eventually overflowed the lava dam and eroded down into it, draining the lake and forming Benham Falls. Geologists estimate that 90% of the magma erupted as lava flows, 9% as scoria which forms the cone, and 1% as volcanic ash which forms a thin layer extending to the north.
The early history of Lava Butte is not known, but it is assumed that Native Americans observed the eruptions and later ascended the prominent new landmark. White settlers arriving in the 1800s also noted the landmark. In 1903, I.C. Russell was the first geologist to study the butte and speculated that it erupted as recently as 150 years ago. Dr. Howel Williams estimated it to be much older, but incorrectly at 1,000 years old. In September 1914, Lava Butte "erupted" when the Bend Chamber of Commerce simulated an eruption to surprise a visiting Portland group. In 1925, USGS geologist Harold Stearns studied the Newberry area and recognized the fissure system which extends from Lava Butte to East Lake within Newberry Caldera.
The cinder cone was also exploited to some extent for its economic value. In June 1926, a quarry was developed in the fault scarp east of Lava Butte as a source for paving material for the first The Dalles-California Highway (later U.S. Route 97). In November 1929, cinders from Lava Butte were shipped to Longview, Washington, to be used in construction of Longview Bridge across Columbia River.
A United States Forest Service fire lookout tower was built on the summit in 1931, and in early 1933 a steep, single-lane road was constructed spiraling up to the summit. In February of that year, the local Skyliners ski club proposed a ski jump on Lava Butte, but it was never built. In June 1946, widening of the road up Lava Butte to two lanes was completed, along with constructing two small parking lots at the summit. The road was later paved in July 1950. The original lookout was replaced with a larger one in 1957, which was subsequently enlarged in 1962 to accommodate a small visitor center and museum on the first floor. In 1998 this was replaced with a new lookout built in the original L-4 style of 1931. In July 1966, twenty-two astronauts trained in Central Oregon for the upcoming Moon landings, at sites including Lava Butte, Lava River Cave, and Newberry Crater. In May 1967 the U.S. Forest Service created the 8,983 acres (3,635 ha) Lava Butte Geological Area to protect the cinder cone, with plans for recreational and interpretive development. Construction of the Lava Lands Visitor Center located just south of the cone began in April 1969 and it was finally dedicated in September 1975. In November 1990, Newberry National Volcanic Monument was created encompassing Newberry Crater, Lava Cast Forest Geological Area, Lava River Cave, and the Lava Butte Geological Area.
||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (April 2009) (Learn how and when to remove this template message)|
- "Lava Butte Vicinity, Oregon". USGS Cascades Volcano Observatory. Retrieved 2008-04-01.
- Harris, Stephen L. (2005). Fire Mountains of the West: The Cascade and Mono Lake Volcanoes (3rd ed.). Mountain Press Publishing Company. pp. 177–8. ISBN 0-87842-511-X.
- Wood, Charles A.; Kienle, Jürgen, eds. (1990). Volcanoes of North America. Cambridge University Press. p. 202. ISBN 0-521-43811-X.
- "Deschutes & Ochoco National Forests: History". US Forest Service. Archived from the original on 2011-03-16. Retrieved 2008-04-01.
- Kresek, Ray (1998). Fire Lookouts of the Northwest (3rd ed.). Historic Lookout Project. ISBN 0-87770-632-8.
- "Lava Butte Lookout". National Historic Lookout Register. Retrieved 2008-04-01.
|Wikimedia Commons has media related to Lava Butte.|
- "Newberry National Volcanic Monument". US Forest Service. Archived from the original on 2010-06-10. Retrieved 2008-04-01.
- "Architectural drawing of 1957 Lava Butte Lookout Tower" (PDF). US Forest Service. Retrieved 2008-04-01.