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 4076–4100 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Anderson Dam Montgomery County | 24 | 2000 | Low | Not Rated |
| Anderson Dam Clay County | 31 | 2005 | Low | Not Rated |
| Anderson Dam Ringgold County | 24 | 1982 | Low | Not Rated |
| Andersen Dam Harrison County | 27 | 2001 | Low | Not Rated |
| Anamosa State Reformatory Dam Jones County | 19 | 1963 | Low | Not Rated |
| Anamosa Jones County | 12 | 1909 | Low | Satisfactory |
| Amos/Everly Dam Polk County | 24 | 1968 | Low | Not Rated |
| Amos Dam Warren County | 29 | 1969 | Low | Not Rated |
| Ammons Roadgrade Structure Monroe County | 30 | 2004 | Low | Not Rated |
| Ames Basin #4 Story County | 12 | 1985 | High | Satisfactory |
| Ames Basin #3 Story County | 10 | 1985 | High | Satisfactory |
| Ames Basin #2 Story County | 13 | 1985 | High | Satisfactory |
| 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 | 37 | 1997 | Low | Not Rated |
| Alfred Dam Wayne County | 34 | 2005 | Low | Not Rated |
| Alden Milldam Hardin County | 11 | 1932 | Low | Not Rated |
| Albia Reservoir Dam Monroe County | 40 | 1938 | Significant | Fair |
| 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 |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.