The Whitewater River Run in Washington State has an ideal streamflow range of 800-3000 cfs. The river is rated a Class III-IV, which means it is considered intermediate to advanced and requires experience and strong paddling skills. The segment mileage is approximately 12 miles and includes rapids such as "The Narrows", "Boulder Drop", and "Pinball". These rapids offer exciting challenges for experienced whitewater paddlers.

The area is regulated by the National Park Service and requires a permit for overnight camping. The use of motorized boats is prohibited, and all visitors must follow Leave No Trace principles. The river is only accessible by foot, and there are no designated put-in or take-out points, so visitors must be prepared for a rugged and remote experience.

According to American Whitewater, the Whitewater River Run offers some of the most challenging and rewarding whitewater paddling in the Olympic Peninsula. However, it is important to note that due to the remote nature of the area and the high level of difficulty, this run is not recommended for novice paddlers. It is crucial to have proper training and gear, along with experience in Class III-IV rapids, before attempting this run.