The Three Sisters area is a potentially active volcanic center located in the High Cascades in Central Oregon.  This center is comprised of North Sister, Middle Sister, South Sister, Broken Top, and Mount Bachelor.  Due to resorts and growing communities, the monitoring and study of this area has become one of great importance (United States Geologic Survey [USGS], 2002d).

View of the Three Sisters                      Photo by Lyn Topinka, USGS

          This web page will present information about the Three Sisters Volcano area of Oregon with an emphasis on North Sister, Middle Sister, and South Sister.  It will include a description of the Three Sisters, a summary of the geology of the area, and a discussion of current events and hazards of the area.



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