Bazile Creek / Loup South Loup River / Platte River / Little Blue River / Big Blue River / Loup North Loup River / Missouri Tribs Bazile Creek / Niobrara River / Loup River / North Loup River / Elkhorn River / Genoa Loup Lower Loup River / Big Blue Big Blue River / South Loup River / Loup Middle Loup River / Middle Loup River / Little Blue Little Blue River / /