Prehistoric jawbone Iowa River

The Iowa River is a tributary of the Mississippi River in the state of Iowa in the United States. It is about 323 miles long and is open to small river craft to Iowa City, about 65 miles from its mouth. Its major tributary is the Cedar River.
  • State: Iowa
  • Source: confluence of East Branch Iowa River and West Branch Iowa River
  • Mouth: Mississippi River
  • Length: 323 mi (520 km)
  • River system: Mississippi River
Data from: en.wikipedia.org