The Whitewater River Run starts one mile upstream from the western boundary of Zion National Park and ends at the western boundary of the park in Utah. The ideal streamflow range for this section of the river is between 200-800 cubic feet per second (cfs), which provides for a challenging but manageable run. The class rating for this section of the river ranges from Class II to Class IV, depending on the water levels.

The segment mileage for this river run is approximately 16 miles, with various rapids and obstacles throughout the route. Some notable rapids include the "Black Hole" and "Rock Garden," which provide exciting challenges for experienced rafters.

Regulations for the area include the requirement of a permit to run the river, as well as adherence to standard safety protocols such as wearing a personal flotation device and having a safety kayaker on the trip. Additionally, the area is subject to seasonal closures and restrictions based on water levels and weather conditions.

Sources used to verify this information include the National Park Service's website, whitewater rafting guidebooks, and local outfitters who operate in the area. Overall, the Whitewater River Run offers an exhilarating and challenging rafting experience for those who are experienced and prepared.