The whitewater river run from Headwaters (Boise Nf) to Confluence with Smith Creek (Smith Creek Landing Strip) (Payette Nf) in the state of Idaho is a popular route for rafters and kayakers alike. The ideal streamflow range for this stretch of river is between 1,000 and 3,000 cfs. This range provides enough water to navigate the rapids while still maintaining a manageable level of difficulty.

The class rating for this segment of the river is class III-IV, which means it has moderate to difficult rapids with high, irregular waves and narrow passages that often require precise maneuvering. The segment is around 12 miles long and is known for its scenic beauty, with towering granite walls and stunning mountain vistas.

Specific rapids and obstacles along this stretch of river include names such as the "Staircase", a series of steep drops and boulder gardens that require expert navigation, and the "Devil's Slide", a narrow chute with a drop of several feet that requires precise maneuvering. There are also several large boulders and log jams that can create dangerous hazards if not navigated properly.

Specific regulations for the area include the need for a permit to launch a raft or kayak. The permit system is designed to limit the number of people on the river at any given time to ensure safety and preserve the natural environment. Additionally, all boaters are required to wear personal floatation devices and are encouraged to pack out all trash and waste to minimize impact on the surrounding wilderness.

Overall, the Headwaters to Smith Creek segment of the Payette River provides a thrilling and scenic whitewater experience for those with the skills and experience to navigate its challenging rapids.