Natural Resource Condition Assessments for Devils Postpile National Monument

A wall of hexgonal rock columns extend up to 60 feet. Broken columns of the gray rock lie at the base of the wall.
Devils Postpile.

NPS Photo

About 100,000 years ago, hot basaltic lava flowing down a valley ran into a glacier. Together they formed what is known today as the Devils Postpile—a collection of hexagonal columns towering up to 60 feet. Located in California’s Sierra Nevada, Devils Postpile National Monument is comprised of 798 acres of pristine mountain habitat. Summer and fall visitors to the park enjoy hiking and fishing; with over 400 inches of snow annually, the park is closed in the winter and fall.

NRCA Publications

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    For other reports and natural resource datasets visit the NPS Data Store.

    Source: NPS DataStore Collection 7765 (results presented are a subset). To search for additional information, visit the NPS DataStore.

    Last updated: August 13, 2025

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