The Iowa River upstream of Marshalltown, Iowa
Map showing the Cedar (to the right) and Iowa (to the left) rivers
|Confluence with the Mississippi River|
|Length||323 mi (520 km)|
|- left||Cedar River|
|- right||English 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 (520 km) long  and is open to small river craft to Iowa City, about 65 miles (105 km) from its mouth. Its major tributary is the Cedar River.
The Iowa then proceeds roughly in a southeast direction, passing through the city of Iowa Falls, through a scenic valley to Steamboat Rock, then through the cities of Eldora, Marshalltown, Tama, and Marengo, and through the Amana Colonies in Iowa County. In Johnson County, it becomes impounded by the Coralville Dam in the Coralville Reservoir, which turns southward to the spillway. The river runs generally south and passes through Iowa City and the University of Iowa campus. A lowhead dam at Burlington Street in Iowa City is the last dam before the river's confluence with the Mississippi. South of Iowa City, it is joined in Washington County by the English River, and then in Louisa County it is joined by the Cedar River to flow into the Mississippi.
The Iowa River is noted for recreational and commercial fishing. Game fish include largemouth and smallmouth bass, walleye, northern pike, channel and flathead catfish, crappie and other panfish. The Coralville Reservoir is commercially fished for carp and buffalo fish.
The Iowa can flood, notably in the June 2008 Midwest floods, and the Great Flood of 1993. The Cedar and its tributaries, including the Shell Rock River, can contribute to flooding events. It tore down the historical swinging bridge in Charles City, Iowa.
|Wikisource has the text of the 1921 Collier's Encyclopedia article Iowa River.|
- Media related to Iowa River at Wikimedia Commons
- U.S. Geological Survey Geographic Names Information System: Iowa River
- New International Encyclopedia. 1905. .