Bare Mountain, West Crater Volcanic Field, Washington

The top of Bare Mountain (foreground) looking towards the southwest. Bare Mountain has two components: a pre-glacial (older than about 20,000 years) andesite lava flow that travelled to the north, after which the top of the eruptive vent was destroyed in an explosive eruption that formed a 475 meter (1550 feet) wide and 145 meter (475 feet) deep crater. This eruption occurred about 7,700 years ago and rated a 3 on the Volcano Explosivity Index scale. Photo by James Genero, CVO summer intern, June 2025.