Vintage Postcard, Dry Falls, Columbia River, Washington, Grand Coulee, Landscape

In north-central Washington is a geologic phenomenon known as the Grand Coulee — a 50-mile gash through columbia Riders colossal Ice-Age ancestor. At this

cut by glacial flood waters of the

point, known as Dry Falls, these glacial flood waters plunged over 400 feet downward in a waterfall 31/ miles wide.