Iowa River
| Iowa River | ||
 Iowa River near Marshalltown |
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| Data | ||
| Water code | US : 457834 | |
| location | Iowa (USA) | |
| River system | Mississippi River | |
| Drain over | Mississippi River → Gulf of Mexico | |
| source | in Hancock County 42 ° 51 ′ 38 ″ N , 93 ° 36 ′ 50 ″ W. |
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| muzzle | near New Boston, IL in the Mississippi River Coordinates: 41 ° 9 ′ 38 " N , 91 ° 1 ′ 26" W, 41 ° 9 ′ 38 " N , 91 ° 1 ′ 26" W |
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| Mouth height |
164 m
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| length | 482 km | |
| Left tributaries | Cedar River | |
| Right tributaries | English River | |
| Medium-sized cities | Iowa City | |
| Small towns | Iowa Falls , Marshalltown | |
 Iowa River in winter |
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The Iowa River is a 482 km long right tributary of the Mississippi River .
The river has two headwaters that have their source in Hancock County . They converge after about 40 kilometers. First, the Iowa River flows southeast through Iowa Falls , Marshalltown, and the Amana Colonies . In Johnson County it makes an arc south and flows through Iowa City . The river is dammed below Iowa City. Before it flows into the Mississippi, the English River and Cedar River meet the Iowa River.