Iowa has 9 navigation dams. The dam maintains water levels sufficient for boat and barge traffic, supporting commercial or recreational navigation on the waterway.
| # | Dam | County | Height (ft) | Hazard | Condition | Year |
|---|---|---|---|---|---|---|
| 1 | Mississippi River Lock and Dam 17 | Mercer | 47 | Significant | Not assessed | 1939 |
| 2 | Mississippi River Lock and Dam 12 | Jo Daviess | 44 | Significant | Not assessed | 1938 |
| 3 | Mississippi River Lock and Dam 13 | Whiteside | 44 | Significant | Not assessed | 1939 |
| 4 | Mississippi River Lock and Dam 10 | Clayton | 43 | Significant | Not assessed | 1937 |
| 5 | Mississippi River Lock and Dam 11 | Dubuque | 43 | Significant | Not assessed | 1937 |
| 6 | Mississippi River Lock and Dam 18 | Des Moines | 41 | Significant | Not assessed | 1937 |
| 7 | Mississippi River Locks and Dam 15 | Scott | 41 | Significant | Not assessed | 1934 |
| 8 | Mississippi River Locks and Dam 14 | Scott | 39 | Significant | Not assessed | 1939 |
| 9 | Mississippi River Lock and Dam 16 | Muscatine | 34 | Significant | Not assessed | 1937 |