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Global Volcanism Program | Image GVP-02972

Trillum Lake provides a dramatic view of the broad debris fan on the south flank of Mount Hood that originated from growth of the Crater Rock lava dome, visible on the upper SW flank just below the summit.  Debris shed off the growing lava dome during the late 18th century formed the undissected fan, which provides year-round skiing from the Timberline ski area. Photo by Dave Wieprecht, 1993 (U.S. Geological Survey).

Trillum Lake provides a dramatic view of the broad debris fan on the south flank of Mount Hood that originated from growth of the Crater Rock lava dome, visible on the upper SW flank just below the summit. Debris shed off the growing lava dome during the late 18th century formed the undissected fan, which provides year-round skiing from the Timberline ski area.

Photo by Dave Wieprecht, 1993 (U.S. Geological Survey).


Hood