Hot lava cooled and cracked some 900,000 years ago to form basalt columns 40 to 60 feet high resembling a giant pipe organ. Thc John Muir Trail between Yosemite and Kings Canyon National Parks crosses the monument.

Proclaimed July 6, 1911; transferred from Forest Service, U.S. Dept. of Agriculture, Aug. 10,1933.

Acreage- 798.46, all federal

Last Modified: July 2, 1999
URL: www.nps.gov/depo/index.htm