The Whitewater River Run from Rainbow Falls to the National Monument Boundary in California is a popular spot for rafting and kayaking. The ideal streamflow range for this section of the river is between 500 and 2000 cfs. The run is rated as Class III-IV, making it suitable for intermediate to advanced paddlers. The segment mileage of this section is approximately 7.5 miles, with a drop of 1800 feet in elevation.

The river is known for its technical rapids, including the popular "Meatgrinder" rapid, which is a Class IV drop with a large boulder in the center of the channel. Other notable rapids include "Pinball" and "Dinky Creek Falls." There are also several sections of calm water that allow paddlers to catch their breath before the next rapid.

There are specific regulations to the area, including a permit requirement for all boaters. The number of permits issued is limited, and they are typically issued on a first-come, first-served basis. Additionally, all boaters must wear a personal flotation device and carry a whistle.

Overall, the Whitewater River Run from Rainbow Falls to the National Monument Boundary is a challenging and exciting paddle for experienced boaters. Proper planning and adherence to regulations are essential for a safe and enjoyable trip.