Emergency crews carry out 20 rescues as 'once in a generation' floods prompt evacuation warnings for 600 homes in America's Four Corners

In southern Colorado, the San Juan River ran a full 3ft higher than a 100-year flood only a year ago. Four inches of rain fell from Wednesday to Friday on ground already soaked by two months of storms that broke a summer drought. Around 1,500 people near Farmington and Shiprock, New Mexico, lost power. Farmington Police Chief Steve Hebbe called it a 'once in a generation' event.
Floodwater closed a 2-mile stretch of US Highway 64 west of Shiprock.
San Juan County officials warned: 'The rivers are expected to rise again.'
Earlier in the week, tornadoes in Arizona tore roofs off homes and downed power lines.
