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Iowa River
| States | Iowa |
| Length | 323.8 miles |
| Watershed Length* | 3,822 miles |
| Mouth | Mississippi River ⤏ Gulf of Mexico |
| GNIS | 457834 |
Tributaries
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| Name | Distance from Mouth (miles) | Length (miles) | Watershed Length (miles) |
|---|---|---|---|
| Asher Creek | 214 | 19 | 19 |
| Big Bear Creek | 136 | 46 | 67 |
| Cedar River | 31 | 338 | 2,349 |
| Clear Creek | 78 | 31 | 31 |
| Davis Creek | 49 | 18 | 18 |
| Deer Creek | 182 | 26 | 26 |
| Dowd Creek | 228 | 16 | 16 |
| English River | 55 | 38 | 210 |
| Goose Creek | 41 | 18 | 18 |
| Honey Creek | 224 | 35 | 35 |
| Iowa River - East Branch | 324 | 40 | 40 |
| Iowa River - South Fork | 237 | 62 | 115 |
| Iowa River - West Branch | 324 | 41 | 41 |
| Linn Creek | 209 | 30 | 30 |
| Long Creek | 25 | 28 | 96 |
| Minerva Creek | 222 | 35 | 69 |
| Old Mans Creek | 63 | 53 | 67 |
| Otter Creek | 162 | 20 | 20 |
| Rapid Creek | 81 | 16 | 16 |
| Richland Creek | 169 | 21 | 21 |
| Salt Creek | 156 | 42 | 73 |
| Short Creek | 31 | 16 | 16 |
| Sugar Creek | 195 | 15 | 15 |
| Timber Creek | 204 | 10 | 50 |
| Walnut Creek | 156 | 26 | 41 |
* Note: Watershed is mostly rivers/streams 15+ miles in length.
Data from United States Geological Survey