The Whitewater River begins in the San Bernardino National Forest at an elevation of 10,000 feet in Section 1, T4S, R1W, HM, and flows for 30 miles before joining the Coachella Canal. The ideal streamflow range for the Whitewater River is between 200-500 cfs. The river is rated as Class V, with several Class IV rapids along its length, making it a challenging and thrilling river run.

The Upper Whitewater River, the section above the Whitewater Preserve, is a popular destination for kayakers and rafters. The segment is approximately 7 miles long and includes several technical rapids, including "Butterfly Falls," "The Chutes," and "S-Curve." The Middle Whitewater River, from the Whitewater Preserve to Mission Creek, is approximately 15 miles long and includes several Class IV rapids, including "The Toilet Bowl," "The Sluice Box," and "The Guillotine." The Lower Whitewater River, from Mission Creek to the Coachella Canal, is approximately 8 miles long and includes several Class III rapids, including "The Maze," "The Rollercoaster," and "The Jaws."

It is important to note that the Whitewater River is a designated Wild and Scenic River, and the use of motorized boats is prohibited. Additionally, boaters must obtain a permit from the Bureau of Land Management before launching on the river. There are also regulations in place to protect the native fish species, including the Santa Ana Sucker, and visitors are encouraged to adhere to Leave No Trace principles.

Overall, the Whitewater River offers a challenging and scenic river run for experienced kayakers and rafters, with specific regulations in place to protect the environment and wildlife.