The Whitewater River is a popular destination for whitewater rafting enthusiasts in California. The run from Wilcox Spring to Clear Lake National Wildlife Refuge Boundary is a challenging section of the river that requires experience and skill. The ideal streamflow range for this section of the river is between 500 and 2000 cfs.

The class rating for this section of the river is Class III to IV, with some rapids reaching Class V during high water. The segment mileage for this run is approximately 10 miles, with several challenging rapids and obstacles along the way.

One of the most challenging rapids on this section of the river is called "Elbow Room", which features a narrow channel and a steep drop. Other notable rapids include "S-Turn" and "Screaming Left".

There are specific regulations that apply to this area, including restrictions on floating devices, fishing, and camping. Visitors are encouraged to check with local authorities for up-to-date information on regulations and safety guidelines.