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Lava Flow and Lava Dome Hazards at Mount Hood

Lava flow hazards are restricted to the flanks of Mount Hood.

Lava flows can destroy all structures in their paths, but they advance so slowly that they seldom endanger people. Future lava flows will be restricted to the volcano’s flanks. Large-volume lava flows could descend valleys and potentially reach highways.

Lava dome hazards can trigger far-travelled hazardous events.

If a lava wells up around the erupting vent and builds a large steep-sided lava dome, the parts of the lava dome could collapse to form hot avalanches and pyroclastic flows that form far-traveled lahars. Hazards of pyroclastic flows and lahars are described in other sections.