Global Volcanism Program | Image GVP-02969
The upper Sandy River valley on the SW side of Mount Hood has been one of the primary channels for lahars and block-and-ash flows during the past 1,800 years. These late-stage eruptions originated from vents and lava domes high on the SW flank.
Photo by Willie Scott, 1995 (U.S. Geological Survey).
This image is made available as a Public Domain Work, but proper attribution is appreciated.