• Devils Postpile Formation

    Devils Postpile

    National Monument California

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  • Devils Postpile National Monument is Open for the Season

    Devils Postpile is open for the 2014 season. The ranger station will be open daily from 9am-5pm. The Devils Postpile campground is open. Ranger walks to Devils Postpile occur daily at 11 am. More »

Natural Features & Ecosystems

Nature and Science

Devils Postpile National Monument was established because of two important geophysical features: the postpile itself and RainbowFalls. The postpiles tower as a sheer wall of polygonal basalt columns up to 60 feet high, and glacial polish is evident on top of many of the columns.

Rainbow Falls is a spectacular waterfall that exists near the southern end of the monument on the San Joaquin River. The river changes in character many times throughout its journey through the monument, evolving along its course from a series of broad low-gradient meanders to scattered pools and fast-flowing rapids, cascades, and falls.

Did You Know?

The tops of the Postpile's columns

Devils Postpile is one of the finest examples of columnar basalt in the world. Approximately 55% of the formation's columns are six-sided. More...