The whitewater river run from Glacier Peak Wilderness Boundary to Confluence with Sauk River in the state of Washington is a popular destination for whitewater enthusiasts. The ideal streamflow range for this run is between 2,000 and 4,000 cfs. The segment mileage for this stretch of river is approximately 7 miles long, and it is rated as a class III-IV river.

The river is fed by multiple tributaries, which contribute to its high flow rate. The river contains several rapids, including Boulder Drop, Railroad, and S-Turn. These rapids offer a fun and challenging experience for whitewater enthusiasts, but they can also be dangerous if not approached with caution.

There are specific regulations that apply to this area. The use of personal flotation devices (PFDs) is mandatory, and all boaters must wear a helmet. The area is also subject to periodic closures due to high water levels or other safety concerns.

Overall, the Glacier Peak Wilderness Boundary to Confluence with Sauk River run offers a thrilling and challenging whitewater experience. However, it is important for boaters to be aware of the specific regulations and to approach the river with caution to ensure a safe and enjoyable experience.