In August 1805 Lewis and Clark crossed the continental divide at the Lemhi Pass to the east of the Lemhi River. There, the group encountered a tribe of Shoshone Indians, one of whom turned out to be Cameahwait, brother of Sacagawea. The expedition sent a reconnaissance party, guided by Swooping Eagle, north along the Lemhi to the Salmon River attempting to find a navigable path, but turned back when they found that the Salmon was not passable by boat or on land.