John Wesley Powell came to Wyoming’s Green River City in 1869 to launch the first of his two expeditions down the Colorado River. Earlier, in 1867-68, he had explored overland in western Colorado, searching for the source of the Colorado River. At first, he intended to start his journey at Grand River, the confluence of the Colorado in Utah with Green River. (Since the Grand heads into Colorado, the state successfully renamed this river the Colorado in 1921.) But when it was time to launch


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