The Whitewater River is a popular river run in Northern California that spans from its headwaters in Sec. 1, T5S, R1E, Hm to its junction with the Mattole River. The ideal streamflow range for this run is between 200-500 cfs. It is rated as a class III-IV river, with segment mileage of approximately 10 miles. The river is known for its challenging rapids and obstacles such as the "Maze," "Surprise," and "Pinball" rapids.

There are specific regulations that must be followed when participating in this river run. All participants must wear a personal flotation device and a helmet. Additionally, groups must have a trip leader who is experienced in whitewater rafting and has knowledge of the river's specific hazards and challenges. It is also important to note that there are no motorized vehicles allowed on the river and all trash must be packed out.

Overall, the Whitewater River run provides an exciting and challenging adventure for experienced whitewater enthusiasts. However, it is important to follow all regulations and safety guidelines to ensure a safe and enjoyable experience.