The Whitewater River Run in California is a popular destination for river enthusiasts. The ideal streamflow range for this section of the river is between 100 and 800 cfs, with the best conditions occurring in the springtime. It is rated as a Class III-IV river, with several challenging rapids throughout the 27-mile segment.

Some of the specific rapids and obstacles to look out for on the Whitewater River Run include the "Staircase," "Pinball," and "Sledgehammer" rapids. These rapids range in difficulty from Class III to Class IV and require advanced paddling skills to navigate safely. There are also several large boulders and fallen trees that add to the complexity of the run.

In terms of regulations, the Whitewater River Run is located within the San Bernardino National Forest and is subject to National Forest regulations. Visitors are required to obtain a permit for overnight camping and are advised to follow Leave No Trace principles to minimize their impact on the environment.

Overall, the Whitewater River Run offers a challenging and exciting experience for advanced paddlers. However, it is important to approach the river with caution and respect for the natural environment.