The Whitewater River Run Confluence with North Fork San Joaquin River to Hells Half Acre in California is an exciting adventure for experienced kayakers and rafters. The ideal streamflow range for this run is between 500-1500 cfs, and the class rating is III-IV. This 7.6-mile segment offers challenging rapids with steep drops, technical maneuvers, and boulder-strewn channels.

There are specific rapids and obstacles on this segment that require skilled navigation and scouting, such as Devil's Staircase, which is a series of steep drops and boulder gardens, and Hells Half Acre, which is a long and technical rapid with large boulders and narrow channels. Other rapids to watch out for include Suicide Falls, Chawanakee Rapids, and Upper and Lower Lumsden Falls.

The area is managed by the U.S. Forest Service, and visitors are required to obtain a permit for overnight camping. The Forest Service also recommends that visitors have experience in whitewater rafting and kayaking and be prepared for the remote and rugged terrain. Additionally, visitors must follow all Leave No Trace principles and adhere to fire restrictions and other regulations to protect the natural environment.

Overall, the Whitewater River Run Confluence with North Fork San Joaquin River to Hells Half Acre is a thrilling adventure for experienced whitewater enthusiasts who are prepared for the technical challenges and remote wilderness setting of this segment.