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The smooth lava rock came from the Shoshone Lava Flow, but about 10,000 years ago the Big Wood River powerfully carved through the lava rock creating this canyon. It is similar in texture to the Utah slot canyons, and is even more intense with the harsh black walls! This adventure is only accessible in the fall and early winter. Flash Floods can occur all other times of the year, and there is no warning when the canyon will fill up with water. Be sure to check water conditions before visiting.