Hell's Half Acre

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 43.5°N
  • 112.45°W

  • 1631 m
    5350 ft

  • 324040
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Hell's Half Acre.

The Global Volcanism Program has no Weekly Reports available for Hell's Half Acre.

The Global Volcanism Program has no Bulletin Reports available for Hell's Half Acre.

Eruptive History


Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
3250 BCE ± 150 years Unknown Confirmed 0 Radiocarbon (uncorrected)

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.

Photo Gallery


A broad frozen lava lake rises almost to the rim of the 800 x 300 m wide summit crater of Hell's Half Acre shield volcano, the easternmost of the young basaltic lava fields of the Snake River Plain. The 300 x 800 m wide lava lake is seen from the summit of the low shield volcano, with East Butte and Middle Butte visible to the west on the upper right horizon. Dominantly pahoehoe lava flows were erupted from a 3-km-long, NW-SE trending vent system in the NW part of Hells Half Acre lava field about 5200 years ago.

Photo by Lee Siebert, 2002 (Smithsonian Institution).
See title for photo information.

Smithsonian Sample Collections Database


There are no samples for Hell's Half Acre in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites