page_title: Devils Postpile National Monument
hierarchical_section_title: Devils Postpile National Monument
caption_attribution_description: English: Devils Postpile National Monument, near Mammoth Lakes in the Eastern Sierra.
context_page_description: Devils Postpile National Monument is a National Monument located near Mammoth Mountain in eastern California. The monument protects Devils Postpile, an unusual rock formation of columnar basalt. It encompasses 798 acres 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.
context_section_description: Devils Postpile National Monument is a National Monument located near Mammoth Mountain in eastern California.  The monument protects Devils Postpile, an unusual rock formation of columnar basalt. It 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.
caption: Basalt columns of Devils Postpile
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