Pyroclastic Flows

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.

Dome-collapse pyroclastic flows, tephra fall, and lahars are common on Mount Hood and have occurred during all eruptive periods of the past 30,000 years. They are very likely to occur in future eruptions.