The Whitewater River Run from Soda Springs Footbridge in Devils Postpile National Monument to Rainbow Falls in California is a popular and challenging whitewater rafting experience. The ideal streamflow range for this section of the San Joaquin River is between 300-800 cfs, making it a Class III-IV rated run.

The segment mileage for this run is approximately 6.5 miles, which includes exciting rapids such as the "Devil's Washbowl," "Hole in the Wall," and "Red's Slide." These rapids offer thrilling drops and challenging obstacles, making for an exciting whitewater experience.

However, it is important to note that this run requires a permit from the National Park Service and is only open during specific times of the year. Additionally, only licensed commercial rafting companies are allowed to guide trips on this section of the river.

In terms of regulations, visitors must follow all Leave No Trace principles and are required to wear personal flotation devices at all times while on the river. Camping is not allowed along the riverbank, and fires are only permitted in designated areas.

Overall, the Whitewater River Run from Soda Springs Footbridge in Devils Postpile National Monument to Rainbow Falls in California is an exhilarating and challenging whitewater experience that requires proper preparation and adherence to regulations.