The Whitewater River Run Headwaters To Trailhead in California is a popular river segment for advanced kayakers and rafters. The ideal streamflow range for this run is between 200-500 cfs. The class rating of this section of the river is Class IV-V, which means that it has turbulent and unpredictable rapids, steep drops, and obstacles that require precise maneuvering.

The segment mileage of this run is approximately 4.5 miles, starting at the headwaters and ending at the trailhead. Some of the specific river rapids and obstacles on this run include "S-turn," "Meatgrinder," and "Carnage Canyon," which are all Class V rapids that require advanced paddling skills and precise navigation.

There are also specific regulations to the area that kayakers and rafters should be aware of. For example, the area is located within the San Bernardino National Forest, so visitors must comply with all of the regulations set by the Forest Service. Additionally, the use of personal flotation devices (PFDs) is mandatory, and visitors should also be aware of any potential fire restrictions in the area.

Overall, the Whitewater River Run Headwaters To Trailhead is a challenging and exhilarating river segment that requires advanced paddling skills and experience. Visitors should always exercise caution and follow all regulations to ensure their safety and preserve the natural beauty of the area.