Established in 1972, Buffalo National River flows freely for 135 miles and is one of the few remaining undammed rivers in the lower 48 states. It carries travelers from running rapids to quiet pools, surrounded by massive bluffs, as it winds through the Ozark Mountains to the White River. Summer in the Ozarks can be very hot and humid, while the rest of the year may be wet and cool or dry and warm, and river levels can rise dramatically in a short period of time.