The Whitewater River Run Wilderness Boundary to NF Boundary, located in southern California, is a popular destination for whitewater enthusiasts. The ideal streamflow range for this run is between 300 and 1,000 cubic feet per second (cfs), which typically occurs during the spring and early summer months.

This section of the Whitewater River is rated as Class III-IV, with several rapids and obstacles to navigate. Some of the most notable rapids include Pinball, which features a series of boulder drops, and S-turns, which has several narrow and technical sections.

The overall segment mileage for this run is approximately 7.5 miles, and it typically takes around 3-4 hours to complete. While there are no specific regulations pertaining to this section of the river, it is important to note that all boaters must wear a personal flotation device (PFD) and follow Leave No Trace principles to minimize environmental impact.