Lake Mead is impressive: It's 1.5 million acres, 110 miles long when the lake is full, 550 miles of shoreline, around 500 feet at greatest depth, 255 square miles of surface, and when filled to capacity, 28 million acre-feet of water, about two years' flow of the Colorado River. Sixty-seven-mile-long Lake Mohave, formed by Davis Dam, still retains in its upper reaches some of the character of the old Colorado River.