The term MISSOURI RIVER CAPITAL is referring to the capital city of the U.S. state of Missouri, which is Pierre. Pierre is a city located in Hughes County, South Dakota, and is the state capital of South Dakota. It is situated on the east bank of the Missouri River, and is the county seat of Hughes County. The city was founded in 1817 by French fur traders, and is named after Pierre Chouteau, Jr., a prominent fur trader in the area.