Devils Postpile National Monument is located near Mammoth Mountain in eastern California. The national monument protects Devils Postpile, an unusual rock formation of columnar basalt. Devils Postpile National Monument encompasses 798 acres (323 ha) and includes two main tourist attractions: the Devils Postpile formation and Rainbow Falls, a waterfall on the Middle Fork of the San Joaquin River. In addition, the John Muir Trail and Pacific Crest Trail merge into one trail as they pass through the monument. Excluding a small developed area containing the monument headquarters, visitor center and a campground; the National Monument lies within the borders of the Ansel Adams Wilderness.
Experience Firsthand the Forces That Shape Our Planet
Few places in the United States contain as much geological diversity as California’s Mono County. While its many mountains and valleys prominently showcase the processes shaping our earth’s crust, the Mono Basin captivates one’s imagination with dramatic evidence of its volcanic nature.