What are two tributaries in the Missouri river?

* Missouri River * Arrow Creek (Montana) * Bad River (South Dakota) * Belt Creek (Montana) * Big Muddy Creek (Montana) * Big Sioux River * Blue River (Missouri) * Boyer River * Cannonball River * Cheyenne River * Cow Creek (Montana) * Crooked River (Missouri) * Dearborn River * Fishing River * Floyd River * Gallatin River * Gasconade River * Grand River (Missouri) * Grand River (South Dakota) * Heart River * James River (Dakotas) * Jefferson River * Judith River * Kansas River * Knife River * Lamine River * Little Blue River (Missouri) * Little Missouri River (North Dakota) * Little Muddy Creek (North Dakota) * Little Sioux River * Loutre River * Madison River * Marias River * Milk River (Montana-Alberta) * Moreau River * Mosquito Creek (Iowa) * Musselshell River * Niobrara River * Nishnabotna River * Osage River * Papillion Creek * Platte River * Platte River (Missouri) * Poplar River (Saskatchewan-Montana) * Redwater River * Roe River * Sixteen Mile Creek (Montana) * Smith River (Montana) * Soldier River * Sun River * Tobacco Garden Creek * Vermillion River (South Dakota) * White River (South Dakota) * Wolf River (Kansas) * Yellowstone River