Iowa Dams
4,124 dams tracked by the National Inventory of Dams
Total Dams
4,124
High Hazard
91
2.2%
Poor / Unsatisfactory
25
Average Age
46 yrs
Hazard Classification
High91 (2.2%)
Significant274 (6.6%)
Low3,759 (91.1%)
Condition Assessment
Satisfactory259 (6.3%)
Fair81 (2.0%)
Poor / Unsatisfactory25 (0.6%)
Not Rated3,759 (91.1%)
Federal
25
State
141
Local
1,938
Private
2,014
Tallest Dams
- Coralville Dam132 ft
- Saylorville Dam125 ft
- County Basin Dam104 ft
- Rathbun Dam100 ft
- Brushy Creek Dam100 ft
High Hazard Dams
- Coralville DamHigh
- Saylorville DamHigh
- Rathbun DamHigh
- Brushy Creek DamHigh
- Big Creek Barrier DamHigh
Poor Condition Dams
All Dams in Iowa
Showing 3726–3750 of 3,759
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Amana Society Wetland Dam Iowa County | 10 | 1995 | Low | Not Rated |
| Amana Millrace Diversion Dam Iowa County | 9 | — | Low | Not Rated |
| Allensworth Dam Montgomery County | 27 | 2024 | Low | Not Rated |
| Allen- Ewing Dam Wayne County | 35 | 1999 | Low | Not Rated |
| Alfred Dam Wayne County | 34 | 2005 | Low | Not Rated |
| Alfred Dam Wayne County | 37 | 1997 | Low | Not Rated |
| Alden Milldam Hardin County | 11 | 1932 | Low | Not Rated |
| Albertson Dam Wayne County | 18 | 2000 | Low | Not Rated |
| Akers Farms Dam Adair County | 31 | 2016 | Low | Not Rated |
| Akerman Dam Mahaska County | 28 | 1966 | Low | Not Rated |
| Airport Park Lake Dam Chickasaw County | 20 | 1979 | Low | Not Rated |
| Ahquabi Silt Dam #2 Warren County | 24 | 1995 | Low | Not Rated |
| Ahquabi Silt Dam #1 Warren County | 26 | 1995 | Low | Not Rated |
| Ahquabi Dredge Spoil Containment Dam 5a Warren County | 19 | 1995 | Low | Not Rated |
| Ahquabi Dredge Spoil Containment Dam 2a Warren County | 36 | 1995 | Low | Not Rated |
| Ahquabi Dredge Spoil Containment Dam 1a Warren County | 39 | 1995 | Low | Not Rated |
| Agri-Development Dam Ringgold County | 27 | 1985 | Low | Not Rated |
| Afmscs Watershed Site 23 Cherokee County | 34 | 1989 | Low | Not Rated |
| Afmscs Subwatershed Site 22 Cherokee County | 29 | 1988 | Low | Not Rated |
| Adel Milldam Dallas County | 15 | 1927 | Low | Not Rated |
| Adamson Dam Decatur County | 23 | 1993 | Low | Not Rated |
| Adams Dam Boone County | 37 | 1967 | Low | Not Rated |
| Adams Dam Lucas County | 28 | 1990 | Low | Not Rated |
| Adams Bros. Dam Jefferson County | 30 | 1988 | Low | Not Rated |
| Adam Dam Jefferson County | 32 | 2017 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.