The flash-flooding hit on Saturday afternoon at Cold Springs canyon, about 100 miles north-east of Phoenix, a popular recreation area easily reached by relatively easy hiking paths. Some know it was as Ellison Creek or Water Wheel swimming holes.
Mr Hornung said the treacherously swift waters gushed for about 10 minutes before receding in the narrow canyon. He estimated flood waters reached 6ft high and 40ft wide.
Source : http://www.independent.ie/world-news/north-america/nine-dead-and-young-boy-missing-in-flash-flood-at-arizona-swimming-hole-35937417.html