The whitewater river run from the Headwaters at Outlet of Blanca Lake to USFS Road 63 in Washington is a challenging and scenic route for experienced kayakers and rafters. This segment spans approximately 6.5 miles and is rated as Class IV+. The ideal streamflow range for this route is between 800-1500 cfs, which typically occurs during the spring snowmelt or heavy rain periods.

The rapids in this section of the river are continuous and technical, with notable features such as "Toilet Bowl" and "The S-Turn." This run also features several waterfalls and steep drops that require advanced boating skills. It is important to note that due to the remote and rugged nature of this area, a high level of self-sufficiency and experience is required to safely navigate the rapids and obstacles.

Specific regulations for this area include a permit requirement for overnight camping, restrictions on campfires, and a strict pack-in, pack-out policy to preserve the pristine wilderness environment. Additionally, there are restrictions on group size and commercial use. It is important to research and adhere to all regulations before embarking on this challenging whitewater adventure.