The Marshall Gulch Recreation Area To Wilderness Boundary in Arizona is a popular whitewater river run. The ideal streamflow range for this section is between 300 and 800 cfs. The class rating for this section ranges from Class II to Class IV, depending on the water level. The segment mileage is around 6.5 miles long.

There are several notable rapids and obstacles along this section of the river, including the Pinball rapid, which is a series of boulders that create a challenging and fun ride. The Devil's Hole rapid is another challenging section that requires careful maneuvering.

In terms of regulations for the area, there are several important rules to keep in mind. Camping is not allowed along the riverbank, and all trash must be packed out. Additionally, visitors are required to obtain a permit before entering the wilderness area.

Overall, the Marshall Gulch Recreation Area To Wilderness Boundary is a thrilling and challenging whitewater river run. With its scenic views and exciting rapids, it's a must-visit destination for any adventure seeker.