The East Fork River, located in Wyoming, is a popular destination for whitewater rafting enthusiasts. The ideal streamflow range for this river is between 300 and 800 cubic feet per second (cfs). The class rating for the East Fork River varies depending on the segment being run, ranging from Class II to Class IV.

The river has a total segment mileage of approximately 27 miles, with the most popular section being a 10-mile stretch from Sibley Lake to the Wyoming/Montana border. This section of the river features exciting rapids such as Deadman's Drop, Boateater, and Fang.

There are specific regulations in place for the East Fork River, including a permit system for commercial outfitters and a limit on the number of rafts allowed on the river per day. In addition, all river users are required to comply with Leave No Trace principles, which includes packing out all trash and minimizing impact on the environment.