The Missouri River flows into the Mississippi River just north of Saint Louis, Missouri.
The Missouri River flows into the Mississippi River just north of Saint Louis, Missouri.
Missouri RiverMissouri River; Illinois River
Missouri River
If you are asking about tributaries... the first river that flows into the Mississippi north of St Louis is the Missouri, but the Missouri is not really considered to be a tributary. It's a major river unto itself. Further north, the Illinois River flows into the Mississippi.
poopy pants
the longest river in the United States; arises in Montana and flows southeastward to become a tributary of the Mississippi at Saint Louis. <><><> But NOT to the Gulf of California.
The Missouri River.
It's the Missouri RiverMissippi River
It's the Missouri RiverMissippi River
The Missouri River flows into the Mississippi River just north of Saint Louis, Missouri.
The Missouri River flows into the Mississippi River just north of Saint Louis, Missouri.
It's the Missouri RiverMissippi River