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Photo of this volcano
  • United States
  • High Cascades Volcanic Arc
  • Composite | Stratovolcano
  • 5800 BCE
  • Country
  • Volcanic Province
  • Landform | Volc Type
  • Last Known Eruption
  • 43.979°N
  • 121.688°W

  • 2,763 m
    9,065 ft

  • 322090
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports available for Bachelor.

The Global Volcanism Program has no Weekly Reports available for Bachelor.

The Global Volcanism Program has no Bulletin Reports available for Bachelor.

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Eruptive History

There is data available for 1 confirmed Holocene eruptive periods.

5800 BCE ± 750 years Confirmed Eruption  

Episode 1 | Eruption North flank (Egan cone)
5800 BCE ± 750 years - Unknown Evidence from Correlation: Magnetism

List of 4 Events for Episode 1 at North flank (Egan cone)

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Lava flow
   - - - -    - - - - Cinder Cone
   - - - -    - - - - Tephra
Deformation History

There is no Deformation History data available for Bachelor.

Emission History

There is no Emissions History data available for Bachelor.

Photo Gallery

Mount Bachelor, SW of Bend, Oregon, is seen here from the north with a neoglacial moraine in the center. No known summit eruptions have occurred during the Holocene, although it was active until the latest Pleistocene and a N-flank vent produced a series of lava flows immediately preceding the eruption of the Mazama ash about 7,700 years ago.

Photo by Willie Scott, 1981 (U.S. Geological Survey).
Kwohl Butte scoria cone in the foreground is part of a 25-km-long chain of small shield volcanoes and scoria cones extending north to Mount Bachelor. South and Middle Sister volcanoes are visible to the left behind the eroded slopes of Bachelor.

Photo by Lee Siebert, 1981 (Smithsonian Institution).
Kwohl Butte is one in a 25-km-long chain of scoria cones and small shield volcanoes south of Mount Bachelor in the central Cascade Range of Oregon. Despite the youthful appearance of the cone, geologic mapping indicates construction of the chain was completed about 12,000 years ago.

Photo by Lee Siebert, 1981 (Smithsonian Institution).
Mount Bachelor, seen here from the summit of Broken Top volcano to the north, was constructed during the late Pleistocene. Holocene eruptions occurred at a cone on the north flank.

Photo by Lee Siebert, 1982 (Smithsonian Institution).
Mount Bachelor is seen here beyond Sparks Lake to the west. It is a late Pleistocene-to-Holocene stratovolcano at the northern end of a 25-km-long chain of scoria cones and small shield volcanoes.

Photo by Lee Siebert, 1982 (Smithsonian Institution).
GVP Map Holdings

Maps are not currently available due to technical issues.

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included.

Smithsonian Sample Collections Database

The following 3 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections, and may be availble for research (contact the Rock and Ore Collections Manager). Catalog number links will open a window with more information.

Catalog Number Sample Description Lava Source Collection Date
NMNH 112584-1 Basalt -- --
NMNH 112584-2 Basalt -- --
NMNH 112584-3 Pumice -- --
External Sites