Resembling a tidy lumber pile created by giants, these60-foot basalt columns are a unique sight to behold. The formation of thisNational Historic Monument began when lava erupted in the valley a little lessthan 100,000 years ago and filled the area to a depth of 400 feet. Then about 10,000years ago, glaciers overrode the fractured mass of lava and quarried away oneside of the Postpile, exposing and polishing a sheer wall of columns thatenhanced the appearance of the natural hexagonal structure.
For a bird's-eye view of Devils Postpile, take the shortsteep trail to the top. Here you'll see not only a cross section of the posts,but the most interesting effect of ice-polished tops on the basalt columns. Themonument is also just a 2-mile hike from beautiful Rainbow Falls, a veryworthwhile trek.
A mandatory shuttle bus is required during the busy summermonths and departs from the Mammoth Adventure Center and The Village atMammoth. In winter, roads are closed, so you'll need to Nordic ski or snowshoeinto the park. During other times of year, driving is allowed but the parkinglot fills up fast, so you'll want to get there early.
For more information on Devils Postpile contact the NationalPark Service / Devils Postpile National Monument Ranger Station in the RedsMeadow Valley
http://www.nps.gov/depo or 760-934-2289.