The Whitewater River Run from the Outlet of Snoqualmie Lake to the Alpine Lakes Wilderness Boundary in Washington is a popular destination for whitewater enthusiasts. The ideal streamflow range for this section of the river is between 700-1500 cfs. The segment covers approximately 8.1 miles and is rated as class III-IV rapids.

Some of the specific rapids and obstacles to watch out for include "Pinball" and "S-Turns." The Pinball rapid is named for its resemblance to a pinball machine as the water bounces off of rocks and creates a challenging obstacle course. The S-Turns rapid is a series of sharp turns that require quick maneuvering.

There are specific regulations in place for this area, including a requirement for a permit to enter the Alpine Lakes Wilderness. Additionally, all motorized boats are prohibited on the river.