The Whitewater River run from Nine Mile Bridge to Confluence With South Fork Trinity River in California is a thrilling and challenging adventure for experienced kayakers and rafters. The ideal streamflow range for this section of the river is between 800 and 2,000 cubic feet per second (cfs), with the higher end of the range providing a more exhilarating ride. The class rating for this run is III-IV, meaning that it is moderately difficult with rapids that require technical skill and experience.

The segment mileage for this section of the Whitewater River is approximately 7 miles, starting at Nine Mile Bridge and ending at the confluence with the South Fork Trinity River. Along the way, the river features several notable rapids and obstacles, including Hell's Kitchen, The Chute, and Pinball. Hell's Kitchen is a particularly challenging drop that requires precise navigation through a narrow chute, while Pinball features a series of boulder gardens that require quick reflexes and careful maneuvering.

It is important to note that there are specific regulations in place for this area, including a requirement for boaters to obtain a permit from the Bureau of Land Management (BLM) before accessing the river. Additionally, all boaters are required to wear personal flotation devices (PFDs) and carry appropriate safety equipment, such as throw ropes and first aid kits. It is also recommended that boaters check current streamflow conditions and weather forecasts before embarking on the Whitewater River run.