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Cottonwood Creek is a popular whitewater river run located in the state of Wyoming. The ideal streamflow range for this river is between 500-1500 cfs. The river is rated as a class III-IV run, which means it is suitable for experienced paddlers who have good control over their boats and are comfortable with rapids and obstacles. The segment mileage of the river is approximately 5 miles, and it offers exciting rapids such as "Pucker Hole" and "Grim Reaper."

One of the notable obstacles on the river is the "Cottonwood Creek Waterfall," which is a 15-foot waterfall that requires a portage. The river also has several technical sections that require careful maneuvering, and paddlers should be aware of potential hazards such as strainers and undercut rocks.

In terms of regulations, all boaters are required to have a permit to enter the river. The permits can be obtained from the Wyoming Game and Fish Department, and they must be displayed on the boat at all times. Additionally, all boaters are required to wear a personal flotation device (PFD) and carry a rescue rope.

Overall, Cottonwood Creek is an exciting and challenging whitewater river run that offers a great experience for experienced paddlers. However, it is essential to follow all regulations and safety precautions to ensure a safe and enjoyable trip.