The Whitewater River Run from Island Park Dam to Box Canyon Summer Homes in Idaho is a popular spot for whitewater enthusiasts. The ideal streamflow range for this section is between 1,000 and 5,000 cubic feet per second (cfs), which typically occurs during the peak snowmelt season in late May and early June. The run is classified as a Class III-IV, meaning it has moderate to difficult rapids and obstacles that require technical skill and experience to navigate safely. The segment covers a distance of approximately 8 miles, with notable rapids such as Big Kahuna, Devil's Cesspool, and Lunch Counter.

There are specific regulations for this area, including a permit requirement for commercial outfitters and a limit on the number of launches per day. Private boaters are also required to register with the local forest service office and follow Leave No Trace principles. Safety equipment such as helmets and life jackets are mandatory, and boaters should be aware of the swift currents, cold water temperatures, and potential hazards such as strainers and undercut rocks. It is recommended that boaters have previous experience and knowledge of whitewater techniques before attempting this run. Sources for this information include the American Whitewater website and the local forest service office.