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The Whitewater River Run from the confluence of East and West Forks of Miller River to the confluence with South Fork Skykomish River in the state of Washington is a popular river for whitewater rafting and kayaking. The ideal streamflow range for this river is between 800 and 2000 cfs, which provides Class III-IV rapids.

The segment mileage for this river run is approximately 9 miles, with a variety of rapids and obstacles to navigate. Some of the notable rapids include Boulder Drop, Horseshoe Bend, and Triple Drop. Boulder Drop is a Class IV rapid that features a large boulder in the center of the river, which creates a challenging passage for kayakers and rafters. Horseshoe Bend is a Class III rapid that requires precise navigation through a sharp turn in the river. Triple Drop is a series of three Class III rapids that require quick maneuvering through small drops and waves.

There are specific regulations that apply to this area, including permits that must be obtained before accessing the river. Additionally, there are restrictions on the number of people allowed on the river at any given time, as well as restrictions on the use of certain types of watercraft. It is important for anyone planning to visit the Whitewater River Run to familiarize themselves with these regulations to ensure compliance and safety. Overall, this river run offers a thrilling experience for experienced whitewater enthusiasts looking for a challenge.