Rex Calloway looked west through the large windows of his 1950s-era farmhouse near Quincy and talked about the time, nearly 70 years ago, that his grandfather first arrived on this land. Back then, the Columbia Basin was dry. A rugged landscape of sagebrush and rolling hills. Rattlesnakes. Scorching summer days. Cold nights. Quincy, the nearest town, was a speck, homesteaders and dry-land farmers eking out an existence on an average of 6 to 8 inches of rain a year.