The Whitewater River is a 30-mile long river located in southern California that flows from its headwaters in Sec. 28, T3S, R1W, Hm to the Pacific Ocean. The ideal streamflow range for this river is between 200 and 400 cubic feet per second (cfs) for kayaking and rafting. The river is rated as a Class III to Class IV for its challenging rapids and obstacles. The river is divided into three segments: the Upper, Middle, and Lower sections. The Upper segment is approximately 6 miles long and offers Class IV rapids, including the infamous "Frog Rock" rapid. The Middle segment is approximately 10 miles long and offers Class III and IV rapids, including "The Chute" and "Butcher Knife." The Lower segment is approximately 14 miles long and offers Class II and III rapids.

There are specific regulations to the area, including a permit system administered by the Bureau of Land Management for all commercial and private users. All users are required to wear a life jacket and helmet while on the river. Additionally, camping is allowed at designated campsites along the river with a valid permit. Overall, the Whitewater River is a challenging and exciting destination for experienced kayakers and rafters looking for a Class III to IV adventure.