The Whitewater River run in the Alpine Lakes Wilderness area of Washington state spans from the wilderness boundary to the private land boundary at the north section line of section 3, T23N, R14E. The ideal streamflow range for this segment is between 300 and 800 cubic feet per second (cfs). This class III-IV river run covers a distance of approximately 5.5 miles, with several notable rapids and obstacles such as the "Entrance Exam," "Boulder Dash," and "The Slot."

The Whitewater River run is subject to specific regulations to protect the wilderness area and its resources. All boaters are required to obtain a permit from the US Forest Service before embarking on this run. Additionally, camping is allowed only at designated campsites, and fires are prohibited within 100 feet of the river and must be contained within established fire rings.

In summary, the Whitewater River run in the Alpine Lakes Wilderness area of Washington state is a thrilling class III-IV river run with a segment mileage of approximately 5.5 miles. The ideal streamflow range is between 300 and 800 cfs, and boaters must obtain a permit from the US Forest Service and follow specific regulations to protect the wilderness area and its resources.