The Whitewater River run from Headwaters in Mount Baldy Wilderness to Wilderness Boundary in Arizona is a thrilling experience for experienced kayakers and rafters. The ideal streamflow range for this run is between 200-500 cfs. The class rating for this run is III-IV, which means that the rapids are moderately difficult to difficult, requiring advanced maneuvering skills. The segment mileage for this run is around 6.5 miles.

Some of the specific river rapids and obstacles include the "Hole-in-the-Wall" rapid, which is a class IV rapid with a steep drop and a large hole that must be avoided. Another challenging obstacle is the "Toilet Bowl" rapid, which is a class III rapid with a narrow chute that requires precise maneuvering. There are also several steep drops and tight turns along the way that require skillful navigation.

There are specific regulations to the area, such as the need for a permit to enter the Mount Baldy Wilderness. Additionally, visitors are required to follow "leave no trace" principles and pack out all trash. There are also restrictions on campfires and camping locations.

Overall, the Whitewater River run from Headwaters in Mount Baldy Wilderness to Wilderness Boundary is a challenging and exciting adventure for experienced kayakers and rafters. It is important to follow all regulations and safety guidelines while enjoying this beautiful and pristine wilderness area.