The Whitewater River run in the Glacier Peak Wilderness Boundary to a point approximately 0.5 mile above the Tall Timbers Range at East Section Line of Sec 13, T28N, R15E in the state of Washington is a popular destination for whitewater enthusiasts. The ideal streamflow range for this section of the river is between 800 and 2000 cfs. The class rating for the run is Class III-IV, making it suitable for intermediate to advanced paddlers. The segment mileage is approximately 5 miles.

There are several notable rapids and obstacles in this section of the river, including the Tumble Creek Rapid, Pinball Rapid, and the S-Bend Rapid. These rapids offer exciting challenges for experienced paddlers and require careful navigation.

As for regulations, the Whitewater River run is located within the Glacier Peak Wilderness and is managed by the US Forest Service. Special regulations apply to this area, including restrictions on group size and camping. Visitors are also required to obtain a permit before entering the wilderness area.

In summary, the Whitewater River run in the Glacier Peak Wilderness Boundary to a point approximately 0.5 mile above the Tall Timbers Range at East Section Line of Sec 13, T28N, R15E in the state of Washington offers exciting Class III-IV rapids, challenging obstacles, and is subject to special regulations. Those planning to visit this area should check with the US Forest Service for the most up-to-date information on regulations and conditions.