The Buffalo River flows freely for 151 miles. Typically, the float season begins on the upper Buffalo in the spring. More water makes this section attractive for visitors seeking a higher level of challenge with whitewater kayaking. The season moves downstream with the months, varying from month to month with rainfall. Unlike rivers that are fed by perennial springs, the Buffalo is largely rainfall dependent. In dry years, the floating season is short and quickly moves down into the Middle and Lower Districts. In wet years, use of the upper river is prolonged with floating opportunities spread out through the park for the entire season.