The East Fork Arkansas River, also known as the Whitewater River Run, is a popular destination for kayaking and rafting enthusiasts in Colorado. The ideal streamflow range for this river is between 400 and 800 cubic feet per second (cfs) according to American Whitewater. This range provides enough water to make the river runable while also not making it too dangerous.

The class rating for the Whitewater River Run is Class IV-V, meaning it is a challenging and technical river. The segment mileage varies depending on which section you choose, but the most popular section is the 6.4-mile run from St. Elmo to Nathrop.

There are several specific river rapids and obstacles on this section of the river, including the Elephant Rock Rapid, Twin Falls, and the Miracle Mile. These rapids offer a thrilling adventure for experienced kayakers and rafters.

It's important to note that there are specific regulations in place for this area, including a limit on the number of commercial outfitters allowed to operate on the river. Additionally, all boaters are required to wear a personal flotation device and have a whistle and a throw rope with them at all times.

Overall, the East Fork Arkansas River offers a challenging and exciting adventure for experienced kayakers and rafters. It's important to always check the streamflow and water conditions before heading out and to follow all regulations in place for the safety of yourself and others on the river.