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 1251–1275 of 3,759
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Hardin Dam Lee County | 32 | 2000 | Low | Not Rated |
| Hardin Dam Taylor County | 24 | 1982 | Low | Not Rated |
| Harkrader Dam Dallas County | 38 | 1969 | Low | Not Rated |
| Harmon Farms Dam Taylor County | 34 | 1996 | Low | Not Rated |
| Harmony Creek Watershed Site 1 Harrison County | 43 | 1958 | Low | Not Rated |
| Harmony Creek Watershed Site 4 Harrison County | 46 | 1958 | Low | Not Rated |
| Harmony Creek Watershed Site 5 Harrison County | 23 | 1958 | Low | Not Rated |
| Harmony Creek Watershed Site 6 Harrison County | 45 | 1958 | Low | Not Rated |
| Harmony Creek Watershed Site 7 Harrison County | 40 | 1958 | Low | Not Rated |
| Harold Dam Montgomery County | 29 | 2005 | Low | Not Rated |
| Haroldsen Dam Buena Vista County | 35 | 1974 | Low | Not Rated |
| Harper Century Farm Dam Harrison County | 42 | 2011 | Low | Not Rated |
| Harris Dam Guthrie County | 46 | 1967 | Low | Not Rated |
| Harris Dam Louisa County | 32 | 1996 | Low | Not Rated |
| Hart Dam Montgomery County | 26 | 2001 | Low | Not Rated |
| Hartman Dam Clarke County | 29 | 1979 | Low | Not Rated |
| Hartsook Dam Ringgold County | 28 | 1998 | Low | Not Rated |
| Harvey Dam Jefferson County | 26 | 2006 | Low | Not Rated |
| Hatfield Dam Adair County | 22 | 1963 | Low | Not Rated |
| Hatfield Dam Adair County | 27 | 1999 | Low | Not Rated |
| Hatfield Partnership Page County | 25 | 2002 | Low | Not Rated |
| Hawkins Dam Decatur County | 31 | 1969 | Low | Not Rated |
| Hawk Investments Dam Iowa County | 7 | 1997 | Low | Not Rated |
| Hawk Lake Dam Union County | 18 | 1967 | Low | Not Rated |
| Hawley Dam Crawford County | 30 | 2009 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.