National Geographic : 1916 Apr
Photograph by A. Schlechten THREE FORKS OF THE MISSOURI RIVER NEAR TIIE CITY OF THREE FORKS, MONTANA Far up in the Rocky Mountains of Montana, at the eastern apex of an equilateral triangle between Helena, Butte, and Three Forks, three mountain rivers come together to make the Missouri. They are the Jefferson, the Gallatin, and theMadison, named byLewis and Clark inhonor of President Jefferson and his two ranking advisers. It was here that Sacajawea, the Indian "birdwoman," guided the Lewis and Clark expe dition from the Dakotas' grasp and climbed to the top of the ridge for a survey of the country. Although carried away inher childhood, sherec ognized the spot as her long-ago home, and announced that she knew the territory from there tothe Pacific. Inthe picture theriver onthe right is the Jefferson, that in the center the Madison, and that to the left the Gallatin.