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The Whitewater River Run in Illinois stretches from Forest Road 2133 to Forest Road 2156 and is a popular destination for kayaking and rafting enthusiasts. The ideal streamflow range for this river is between 200-500 cubic feet per second (cfs), although it can vary depending on weather conditions. The class rating is around II-III, which means it is suitable for intermediate paddlers.

The segment mileage of the Whitewater River Run is approximately 7 miles, with several rapids and obstacles along the way. One of the notable rapids is called "Whitewater Falls" and is located towards the end of the run. It is rated as a class III rapid and can be challenging for even experienced paddlers.

There are specific regulations that apply to the Whitewater River Run. Visitors are required to obtain a permit from the U.S. Forest Service before accessing the area. Additionally, visitors are not allowed to camp along the riverbank, and they are required to pack out all trash and waste.

In conclusion, the Whitewater River Run in Illinois is a popular destination for kayaking and rafting enthusiasts. The ideal streamflow range is between 200-500 cfs, and the class rating is around II-III. The segment mileage is approximately 7 miles, with several rapids and obstacles along the way. Visitors should be aware of specific regulations that apply to the area, including obtaining a permit and packing out all trash and waste.