The Whitewater River Run from the National Monument Boundary to the Soda Springs Footbridge in Devils Postpile National Monument, California, is a popular destination for whitewater enthusiasts. The ideal streamflow range (cfs) for this section of the river is between 150-600 cfs. The class rating for this section of the river ranges from II to IV, depending on the water level.

The segment mileage for this section of the river is approximately 6 miles. Along the way, paddlers can expect to encounter a series of rapids and obstacles, including the "Devil's Slide," "Rainbow Falls," and "Hole in the Wall." These rapids are challenging and require skill and experience to navigate.

To ensure the safety of all visitors, there are specific regulations in place for the Whitewater River Run. Paddlers are required to wear personal flotation devices (PFDs) and helmets at all times while on the river. Additionally, groups of 15 or more are required to obtain a permit from the National Park Service prior to entering the river.

In conclusion, the Whitewater River Run from the National Monument Boundary to the Soda Springs Footbridge in Devils Postpile National Monument is a challenging and exciting whitewater destination. With the ideal streamflow range, class rating, segment mileage, specific river rapids/obstacles, and specific regulations, paddlers can safely enjoy the beauty and thrill of this section of the river.