Devils Postpile
Devils Postpile is a striking geological formation of columnar basalt near _Mammoth Lakes, California — accessible via a popular shuttle and trail. The site is renowned for **geometric basalt columns**, remnants of ancient lava flows, and is complemented by nearby Rainbow Falls_ and alpine lakes.
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Geography
| Continent | North America |
|---|---|
| Region | Western United States |
| Subregion | Eastern California |
| Country | United States |
| State | California |
| County | Monroe County |
| District | Devils Postpile National Monument |
| City | Mammoth Lakes |
| Timezone | AmericaLos Angeles |
| Latitude | 37.615 |
| Longitude | -119.135 |
| Maps |
11:54 AM LOCAL TIMEDevils Postpile is a dramatic geological marvel carved from columnar basalt, located just east of Mammoth Lakes, California. The formation was reserved as part of Devils Postpile National Monument after being quarried in the early 20th century, and today it’s reached by a dedicated shuttle and trail system. Visitors come to see the regular, polygonal columns that rise from the valley floor—an iconic example of lava cooling and fracturing—and often pair the visit with hikes to Rainbow Falls or the Patterson Lakes basin. The area is alpine and best-seasoned from late spring through early fall, with glacier-fed streams and a mix of short walks and longer backcountry routes. Expect facilities at the tram station, and plan for crowds on summer weekends—the landscape is worth the effort.
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