The Whitewater River run in the Glacier Peak Wilderness Boundary to Confluence with White River, Washington, is a popular river for kayaking and rafting. The ideal streamflow range for this run is between 500-2000 cfs. The class rating for this river is mostly class III, with a few class IV rapids thrown in. The segment mileage for this run is around 15 miles, making for a full day of rafting or kayaking.

Some of the specific rapids and obstacles on this river include the Boulder Drop, which is a class IV rapid that requires precise navigation, and the Chute, which is another class IV rapid that requires quick maneuvering. Other notable rapids include Fence Line, Mouse Eater, and Chaos.

It is important to note that the Glacier Peak Wilderness Boundary is a protected area, and there are regulations in place to ensure minimal impact to the environment. Visitors to the area should practice Leave No Trace principles and obtain any necessary permits before entering the wilderness. Additionally, motorized boats are not allowed in this area, and camping is only permitted in designated campsites.