The Whitewater River Run in the state of Washington is a thrilling adventure for whitewater enthusiasts. The ideal streamflow range for this river is between 500 and 2000 cubic feet per second (cfs). The class rating for this run is class III-IV, which means it is suitable for intermediate to advanced paddlers. The segment mileage of the Whitewater River Run from Headwaters to Confluence with Gray Wolf River is approximately 10 miles.

The river rapids and obstacles that paddlers will encounter on this run include continuous class III rapids, tight boulder gardens, and steep chutes. Some of the notable rapids on this run include Zig Zag, S-Turn, and The Toilet Bowl. These rapids require technical paddling skills and a good understanding of river hydraulics. Paddlers should be prepared for a challenging and exhilarating experience on this river run.

There are specific regulations to the area that paddlers must be aware of. A permit is required to access the Olympic National Forest, where the river run is located. The permit can be obtained through the National Forest Service website. Additionally, paddlers must follow Leave No Trace principles and pack out all trash and waste.

In conclusion, the Whitewater River Run in Washington is a challenging and exciting adventure for whitewater enthusiasts. Paddlers must be prepared for a technical and demanding experience on the river. It is important to follow regulations and Leave No Trace principles to preserve the natural beauty of the area.