The Whitewater River Run in Washington state stretches from its headwaters to the confluence with Duckabush River. The ideal streamflow range for this river is between 200 - 1000 cubic feet per second (cfs) in the summer and fall months. The river is rated Class III-IV, which makes it suitable for experienced paddlers. The segment mileage of this river run is approximately 14 miles.

Some of the rapids and obstacles that paddlers may encounter on the Whitewater River Run include Beaver Slide Rapid, Rattlesnake Rapid, and The Slot. These rapids are known for their technical and challenging nature, which adds to the thrill of this river run.

There are specific regulations that paddlers must follow when accessing and using this river run. For instance, all paddlers are required to wear a life jacket and helmet while on the river. Additionally, paddlers must obtain a permit from the Olympic National Forest prior to using the river.

In conclusion, the Whitewater River Run in Washington state is a challenging and exhilarating river run for experienced paddlers. With its ideal streamflow range, class rating, and specific rapids and obstacles, this river run provides a unique and exciting adventure for anyone seeking a thrilling ride. Paddlers must follow specific regulations to ensure their safety and environmental conservation of the area.