The Whitewater River Run is a popular 15-mile stretch of the Colorado River, located within the Glen Canyon National Recreation Area in Utah. The ideal streamflow range for this run is between 2,000 and 20,000 cubic feet per second (cfs), with the best time to run it being in the spring and early summer.

This run is rated as a Class II-III stretch, with a few Class IV rapids in some areas. Some of the specific rapids and obstacles to look out for include the "Cathedral Rapid," "Hell's Half Mile," and "The Wall." There are also several fun play spots along the way, including "Little Niagara" and "Big Drop 2."

It is important to note that certain regulations apply to this area. Visitors are required to have a permit to enter the Glen Canyon National Recreation Area, and all boaters must follow Leave No Trace principles. Additionally, motorized boats are not allowed on this stretch of the river, and there are specific camping regulations in place to protect the surrounding environment.

In summary, the Whitewater River Run is a thrilling Class II-III stretch of the Colorado River, with a few challenging Class IV rapids. The ideal streamflow range is between 2,000 and 20,000 cfs, and visitors must follow specific regulations to protect the environment.