Eruptions at Mount Hood During the Past 30,000 Years

Mid-1800Ôs
Small steam and ash explosions

About 200 years ago
Lava dome at Crater Rock; pyroclastic flows, lahars in south and west valleys, and minor tephra falls

About 1,500 years ago
Debris avalanche from upper south flank; lava dome near Crater Rock, pyroclastic flows, lahars in south and west valleys; substantial tephra falls near volcano

30,000 to 15,000 years ago
Multiple episodes of lava dome growth, pyroclastic flows, lava flows, lahars, and tephra fall; valleys on all flanks affected