.

The Whitewater River Run in the state of Washington is a thrilling adventure for experienced kayakers and rafters. The ideal streamflow range for this river is 800-3500 cfs, and it is rated as class III-IV. The segment mileage for this river run is around 7.5 miles, starting at the headwaters and including all tributaries downstream from the end of Graves Creek Road and confluence with Graves Creek to the western boundary of Olympic National Park.

The river is known for its technical rapids and obstacles, including Boulder Drop, which is a class IV rapid with a steep drop and a large, undercut boulder that creates a challenging obstacle for boaters. Another notable rapid is S-Turn, a class III rapid with a series of tight turns and eddies that require precise maneuvering skills.

There are specific regulations to the area that boaters must follow, including obtaining a permit to access the river from the Olympic National Park. Additionally, boaters must practice Leave No Trace principles and avoid disturbing the natural habitat and wildlife in the area.

Overall, the Whitewater River Run is a thrilling and challenging adventure for experienced kayakers and rafters, and boaters should be prepared for technical rapids and obstacles while following specific regulations to protect the natural environment.