The Whitewater River Run is a popular destination for kayakers and rafters looking for a thrilling adventure in California. The ideal streamflow range for this run is between 500-2000 cfs, which provides enough water for a challenging yet safe ride. The segment mileage for this run is approximately 0.5 miles, starting 0.25 miles upstream of the impoundment at Sportsman's Lodge and ending 0.25 miles downstream.

This section of the Whitewater River is rated as Class III-IV, which means that it is suitable for experienced paddlers with good technical skills. The river features several rapids and obstacles, including boulder gardens, steep drops, and tight turns. Some of the notable rapids on this run include S-turn, Rollercoaster, and Meatgrinder.

It is important to note that there are specific regulations in place for this area. All participants must wear a personal flotation device (PFD) at all times while on the river. Additionally, commercial guiding services are required to have a permit to operate on this stretch of the river.

In conclusion, the Whitewater River Run provides a thrilling and challenging experience for experienced kayakers and rafters. The ideal streamflow range, class rating, segment mileage, specific river rapids/obstacles, and specific regulations make it a popular destination in California for those seeking an adventure on the water.