The Grand Canyon river run on the Colorado River is a challenging and exciting adventure for experienced rafters. The river features numerous obstacles, such as large rapids, strong currents, and submerged rocks. The difficulty of the run varies depending on the water level, with high water levels resulting in more challenging rapids. The best time of year to float this section of water is typically from May to September, with recommended cfs (cubic feet per second) ranging from 8,000 to 22,000. It is important for rafters to have proper gear and experience, as the Grand Canyon river run can be dangerous if not approached with caution.