The Whitewater River Run from Confluence with Nankoweap Creek to Red Canyon and the Beginning of Upper Granite Gorge in Arizona is a challenging and exhilarating adventure for experienced kayakers and rafters. The ideal streamflow range for this section is between 5,000 and 20,000 cfs, usually occurring during the spring melt and monsoon season.

This section is rated as Class III-IV, with a segment mileage of around 23 miles. The river rapids and obstacles include House Rock Rapid, Kwagunt Rapid, and Vasey's Paradise. The House Rock Rapid is a Class IV rapid located at the start of the run, with a large hole at the bottom of the rapid that can be difficult to navigate. Kwagunt Rapid is also a Class IV rapid located in the middle of the run, with a steep drop and large waves. Vasey's Paradise is a beautiful waterfall that requires careful navigation.

The specific regulations for this area include a permit system, with a limited number of permits available each year. Additionally, all boaters must follow Leave No Trace principles and pack out all trash and waste. The use of portable toilets is required, and campfires are only allowed in designated fire rings.

In conclusion, the Whitewater River Run from Confluence with Nankoweap Creek to Red Canyon and the Beginning of Upper Granite Gorge in Arizona is a thrilling adventure for experienced kayakers and rafters. With its challenging rapids and beautiful scenery, this section is a must-visit for any whitewater enthusiast. It is important to follow all regulations and guidelines to preserve the natural beauty of the area.