The Alsea River in Oregon is a popular destination for whitewater rafting and kayaking. The ideal streamflow range for the Alsea River is between 800 and 2000 cubic feet per second (cfs). This provides enough water for a thrilling ride while still maintaining safety for paddlers. The river is typically rated as a Class III to Class IV, with some sections reaching Class V. The segment mileage of the Alsea River run is approximately 10 miles, starting at the Blackberry Campground and ending at the Alsea Falls Recreation Site.

There are several specific rapids and obstacles along the Alsea River, including the notorious "Boulder Drop", a Class IV rapid with a large boulder in the middle of the river. Another challenging section is the "Washboard" rapid, which is a technical rapid that requires precise maneuvering to navigate safely.

There are specific regulations in place for the Alsea River area, including a permit system for commercial outfitters and a ban on alcohol and glass containers. Additionally, paddlers are required to wear personal flotation devices (PFDs) at all times while on the river. It is important to note that the Alsea River can be dangerous and should only be attempted by experienced paddlers with proper equipment and safety gear.