Gazzllatin

The Gallatin River descends from the Yellowstone high country through a mountain canyon and north across a broad valley. Beyond the ranges it joins the Madison and Jefferson rivers to form the Missouri. The mountains and valleys around these headwaters were used by Shoshone and other Indigenous peoples. By the mid-eighteenth century, the Blackfeet had obtained firearms and drove the Shoshone from much of the upper Missouri country. Lewis and Clark reached the meeting of the three rivers in 1805.