Description
"Dry Falls is the head of lower Grand Coulee. Umatilla Rock and Dry Falls Lake are shown. It is about a 400 foot drop from camera location to the lake below. The area pictured was carved during immense flooding at the end of the last Ice Age, about 15,000 years ago. Water rushed over this cataract which is 400 feet high and 3 1/2 miles wide, far larger than Niagara. Photo is a join of two 6x6 cm color negative shots."