The Whitewater River Run in San Mateo Wilderness Boundaries to NF Boundary with Camp Pendleton in California is a popular whitewater rafting destination. The ideal streamflow range for this river is between 200 and 600 cfs, with the optimal time to go being during the spring snowmelt or after a heavy rain.

This river is classified as a Class III-IV, meaning it is moderately difficult and requires some experience and skill to navigate. The segment mileage of this river run is approximately 9 miles.

There are several notable rapids and obstacles on this river, including Devil's Slide Rapid, which is a Class IV rapid with a tricky move through a narrow chute, and The Narrows, a Class III rapid with tight turns and boulder obstacles.

It is important to note that this river is located on Camp Pendleton, a military base, and therefore specific regulations and permits are required to access and raft on the river. All river users must obtain a permit from the base's Natural Resources Office and follow all safety regulations and guidelines.

Overall, the Whitewater River Run in San Mateo Wilderness Boundaries to NF Boundary with Camp Pendleton is a challenging and exciting whitewater rafting destination, but it is important to follow all regulations and safety precautions to ensure a safe and enjoyable experience.