The Lewis and Clark Expedition made a number of discoveries near the Great Falls. On June 13, Silas Goodrich caught numerous Westslope cutthroat trout at the falls, the first time anyone in the expedition had seen these fish, and several samples were preserved which constituted the type specimens for the fish. The trout was subsequently given the scientific name "Oncorhynchus clarki lewisi" in honor of the expedition leaders. The Westslope cutthroat is now the "official state fish" of Montana. The explorers also collected the first samples of the gumbo evening primrose and western meadowlark at the Great Falls.