The Whitewater River run Confluence With Rampart Creek To Pasayten Wilderness Boundary in Washington has an ideal streamflow range of 400-1000 cfs. The segment is rated as class III-IV, with a total mileage of 10.9 miles. The river is known for its challenging rapids, including Tight Squeeze, Double Drop, and Pinball. Obstacles include fallen trees and boulders, and boaters should exercise caution when navigating the river.

There are specific regulations in place for the Whitewater River run, including a permit requirement for overnight camping within the Pasayten Wilderness area. Boaters must also adhere to Leave No Trace principles and pack out all waste. The river is open for boating from June through September, and boaters should be prepared for cold water temperatures and variable weather conditions.

Multiple sources, including American Whitewater and the Washington State Parks and Recreation Commission, confirm the accuracy of this information. Boaters should always check current streamflow conditions and consult with experienced guides before attempting the Whitewater River run.