Uniformitarian science has been unable to explain wind and water gaps, but they are easily accounted for by the recessional stage of the Flood. Eight water gaps and three wind gaps in southwest Montana confirm that the three major and one minor uniformitarian hypotheses fall short, while the Flood provides a reasonable explanation. This model is further supported by other features examined—large slack water and eddy gravel bars, whose size and placement require drainage of great proportion, like those formed by the Lake Missoula Flood.