When Lewis and Clark passed through this terrain in 1805 and 1806, wildlife that might have served as food was scarce. The day before the Corps of Discovery reached this point, Lewis wrote that the lack of game was a problem. As they traveled here, Clark obtained a bighorn sheep by the river, and Lewis and Drouillard shot some elk in the hills during a search for the Shoshone Indians. The shortage of large game became a continuing theme as the expedition attempted to cross the continental divide, one of many hardships the Corps faced as they entered the mountains.