At 2,764 meters (9,068 feet) high, Mount Bachelor is the prominent peak just south of the Three Sisters in central Oregon.


It is located within the Deschutes National Forest, 20 km west-southwest of Bend, Oregon. Mount Bachelor is the largest volcano in the 25-km-long, north-south trending, Mount Bachelor volcanic chain, which is composed of numerous cinder cones, lava flows, and shield volcanoes and covers and area of nearly 250 km2 (100 mi2). Eruptions of the chain began during or closely following the retreat of late Pleistocene glaciers (after about 18 ka) and ended before the eruption of Mount Mazama (Crater Lake at 7.7 ka), with the main pulse of activity lasting perhaps only 3,000 years. The volcanic chain produced mainly lava flows and near-vent tephra falls. The chain is typical of one style of mafic (basalt to andesite) volcanism found throughout the Cascades Volcanic Arc—effusive eruptions from aligned short-lived volcanic vents.


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