A series of storms in the latter part of December 1996 and the first week in January 1997 caused flooding and erosion in the Sierra Nevada and adjacent Central Valley, California. One of the larger landslides triggered by this climatic event was the Sourgrass debris flow. The debris flow occurred at about 6:30 pm on January 1, 1997. The U.S. Geological Survey noted this slope movement during an aerial reconnaissance of the central Sierra Nevada after the New Years storm. The debris flow is also known as the Dorrington debris flow (For more information please see a U.S. Geological Survey report online: http://landslides.usgs.gov/recent/archives/1997sierra.php).
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