The Little Missouri River runs 147 miles through the Ouachita Mountains in southwest Arkansas. This cold, rocky mountain stream is known for its clear waters, deep pools, and narrow wooded canyons. Through its upper stretches, it drops over 1,000 feet, creating beautiful waterfalls, chutes, and fast rapids like the Class IV Winding Stair Rapid before it joins the Ouachita River. Designated a National Wild and Scenic River in 1992, the Little Missouri is a popular spot for its stunning views and great swimming holes.