Global Volcanism Program | Image GVP-02972
Trillium Lake provides a dramatic view of the broad debris fan on the S flank of Mount Hood that originated from growth of the Crater Rock lava dome, visible on the upper SW flank just below the summit. Dome growth and collapse produced block-and-ash flows and resulted in lahars down the Sandy River and White River drainages.
Photo by Dave Wieprecht, 1993 (U.S. Geological Survey).
This image is made available as a Public Domain Work, but proper attribution is appreciated.