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 2501–2525 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Iowa Noname3 Appanoose County | 36 | 1972 | Low | Not Rated |
| Iowa Noname29 Lucas County | 45 | 1970 | Low | Not Rated |
| Iowa Noname27 Louisa County | 34 | 1966 | Low | Not Rated |
| Iowa Noname26 Lee County | 34 | 1966 | Low | Not Rated |
| Iowa Noname25 Keokuk County | 27 | 1972 | Low | Not Rated |
| Iowa Noname24 Jasper County | 32 | 1972 | Low | Not Rated |
| Iowa Noname22 Iowa County | 47 | 1972 | Low | Not Rated |
| Iowa Noname21 Harrison County | 30 | 1965 | Low | Not Rated |
| Iowa Noname20 Humboldt County | 21 | 1968 | Low | Not Rated |
| Iowa Noname19 Henry County | 27 | 1957 | Low | Not Rated |
| Iowa Noname18 Harrison County | 37 | 1961 | Low | Not Rated |
| Iowa Noname17 Hardin County | 32 | 1965 | Low | Not Rated |
| Iowa Noname16 Guthrie County | 34 | 1968 | Low | Not Rated |
| Iowa Noname15 Guthrie County | 26 | 1959 | Low | Not Rated |
| Iowa Noname14 Fremont County | 22 | 1961 | Low | Not Rated |
| Iowa Noname12 Des Moines County | 32 | 1967 | Low | Not Rated |
| Iowa Noname11 Decatur County | 44 | 1969 | Low | Not Rated |
| Iowa Noname100 Madison County | 31 | 1991 | Low | Not Rated |
| Iowa Noname10 Decatur County | 30 | 1967 | Low | Not Rated |
| Iowa Gun Dog Dam Clarke County | 29 | 2020 | Low | Not Rated |
| Iowa Falls Milldam Hardin County | 26 | 1925 | Significant | Fair |
| Iowa Dnr Noname 1 Crawford County | 28 | 2006 | Low | Not Rated |
| Innes Jalas Subwatershed Site 3-1 O'Brien County | 30 | 1966 | Low | Not Rated |
| Indian Cr-Van Buren Watershed Site 30 Van Buren County | 29 | 1989 | Low | Not Rated |
| Indian Cr-Van Buren Watershed Site 21 Van Buren County | 32 | 1988 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.