Mile 7.5 - Badger Creek Rapid
During the monsoon season of late summer, and also during other times of heavy rain or snowmelt, side canyons often flood. Flash flooding results in mud, rock, and boulders being pushed into the river with great force. Rapids are created by debris in the river channel, constriction, and abrupt drops in elevation. The results of flooding side canyons are usually the reason for the existence of rapids in Grand Canyon. It becomes noticeable, even to novice river runners, that almost all of the significant rapids throughout the canyon are located directly below at least one prominent side canyon.