The Whitewater River is located in the Pasayten Wilderness area of Washington state and is known for its challenging rapids and stunning scenery. The ideal streamflow range for this run is between 300 and 1000 cfs, although experienced paddlers may tackle it at higher levels. The class rating for this section of the river is primarily class III-IV, with some sections reaching class V during peak flow.

The segment mileage for the Whitewater River run from the Pasayten Wilderness Boundary to the confluence with the Methow River is approximately 8 miles. During this stretch, paddlers will encounter challenging rapids such as Pinball, Elbow Room, and Hell's Kitchen.

In terms of regulations, the Pasayten Wilderness area is a designated wilderness area, which means that visitors should adhere to Leave No Trace principles. Additionally, all visitors are required to obtain a Wilderness Permit prior to entering the area. Overall, the Whitewater River run is a thrilling and challenging adventure that requires technical paddling skills and a respect for the natural environment.