The Whitewater River run in California is a popular whitewater rafting destination for adventure enthusiasts. The ideal streamflow range for this segment of the river is between 500-2000 cfs. The class rating of the river ranges from Class II-IV depending on the water level. The total segment mileage is approximately 7.5 miles, starting from the reserve boundary in Sec. 18, T3N, R1E, H.M. to the headwaters in Sec. 22 and 28, T3N, R1E, H.M.

The river has several specific rapids and obstacles that add to the thrill of the adventure. The most popular rapids include The Pucker Factor, The Maze, The Slide, and The Staircase. These rapids range from Class II-IV and require experienced rafters to navigate them safely. The river also has several boulder gardens, which can be challenging to maneuver.

There are specific regulations that must be followed while rafting on the Whitewater River. All rafters must wear a personal flotation device at all times. Alcohol and drug use are strictly prohibited while rafting. Additionally, no littering is allowed, and all trash must be packed out.

In conclusion, the Whitewater River run in California is a thrilling adventure for experienced rafters. The ideal streamflow range is between 500-2000 cfs, and the class rating ranges from Class II-IV. The segment mileage is approximately 7.5 miles, with several specific rapids and obstacles. Specific regulations such as wearing a personal flotation device and prohibiting alcohol and drug use must be followed.