The Powder River gathers itself in Northwest Wyoming and rumbles between gunpowder-dry riverbanks north into Yellowstone country. After crossing it in the late 1800s and putting a few celebratory pistol rounds through the roof of a saloon, a cowboy coined the phrase Powder River, Let er buck. Wyoming troops used the refrain in the Spanish American War; they still do today. Youll hear it at Wyoming fairs, rodeos, and football games. Its uniquely Wyoming – just like our whiskey.