Ash/Tephra Fall

Mount Hood is Oregon's highest peak and an active volcano of the Cascade Range.

Mount Hood, which has been active for at least 500,000 years, occupies a long-lived focus of volcanic activity that has produced ancestral Hood-like volcanoes for the past 1.5 million years.

Mount Hood has typically not produced thick, extensive deposits of tephra, but relatively modest amounts of tephra were produced during past lava-flow and lava-dome eruptions.