Cache consists of a clear Rubbermaid container with logbook, pencil, pencil sharpener, standard cover sheet, and flyers of the Ice-Age Floods Institute (IAFI). The IAFI is a non-profit organization devoted to informing and educating the public about these unique geologic events that shaped the Pacific Northwest as recently as 13,000 years ago. See www.iceagefloodsinstitute.org, for more information.
Cache Elevation: 905 ft
Devils Canyon is one of the most dramatic features left behind by the great Ice-Age floods. Devils Canyon is a dry, 5-mile-long recessional cataract canyon created by Ice-Age floods. These floods began as early as 1 to 2 million years ago and the last one was about 13,000 years ago. It’s both extremely narrow and deep (500 feet). The canyon connects Washtucna Coulee with the Snake River.
Here, floodwaters took advantage of a zone of weakness along an underlying deep tectonic fracture in the Earth’s crust. During flooding, the 400 foot difference in water levels between Washtucna Coulee and the Snake River caused floodwaters to erode this canyon with exceptional force. The result was a deep, ruler-straight chasm to the Snake River. After filling Washtucna Coulee to the brim near Kahlotus, floodwaters escaped over a low divide carving a spillover channel at the north end of Devils Canyon.
Floodwaters repeatedly spilled over into Devils Canyon from Washtucna Coulee. Only the lighter-colored Palouse uplands on either side of the canyon escaped the floods’ wrath. During repeated floods, a waterfall cliff (cataract) receded up the canyon, stopping just short of Kahlotus. The cache is located along the now-dry wall of the cataract below.
To experience more incredible features left behind by the Ice-Age floods try finding these other geocaches placed by geologist Bruce Bjornstad:
Upper Goose Lake
Frenchman Coulee Rib
Rattlesnake Slope Erratics
Saddle Mountains Overlook (Earthcache)
Wallula Gap Overlook
West Bar Overlook
Lake Sacajawea Flood Bar