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 2701–2725 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Held Watershed Site A-1 Plymouth County | 54 | 1965 | Low | Not Rated |
| Heistand/Swain Dam Harrison County | 26 | 1968 | Low | Not Rated |
| Heistand/Erlewine Dam Harrison County | 31 | 1968 | Low | Not Rated |
| Heisler Subwatershed Site 2-1 Woodbury County | 40 | 2004 | Low | Not Rated |
| Heisler Creek Subwtrshd Sta 8+80 #3f-2 Woodbury County | 25 | 1960 | Low | Not Rated |
| Heisler Creek Subwtrshd Sta 46+80 #3d Woodbury County | 34 | 1960 | Low | Not Rated |
| Heisler Creek Subwtrshd Sta 39+84 #3 Woodbury County | 46 | 1960 | Low | Not Rated |
| Heisler Creek Subwtrshd Sta 29+80 #3d Woodbury County | 40 | 1960 | Low | Not Rated |
| Heishman Dam Poweshiek County | 40 | 2017 | Low | Not Rated |
| Heeren Dam Franklin County | 20 | 1969 | Low | Not Rated |
| Hedstrom Dam Taylor County | 25 | 1991 | Low | Not Rated |
| Head Dam Fremont County | 24 | 2023 | Low | Not Rated |
| Hays Dam Johnson County | 22 | 2002 | Low | Not Rated |
| Hayes Dam Page County | 32 | 2012 | Low | Not Rated |
| Hayes Cattle Company Dam Union County | 29 | 2017 | Low | Not Rated |
| Hawthorne Lake Dam Mahaska County | 45 | 1979 | Significant | Satisfactory |
| Hawley Dam Crawford County | 30 | 2009 | Low | Not Rated |
| Hawk Lake Dam Union County | 18 | 1967 | Low | Not Rated |
| Hawk Investments Dam Iowa County | 7 | 1997 | Low | Not Rated |
| Hawkins Dam Decatur County | 31 | 1969 | Low | Not Rated |
| Hatfield Partnership Page County | 25 | 2002 | Low | Not Rated |
| Hatfield Dam Adair County | 27 | 1999 | Low | Not Rated |
| Hatfield Dam Adair County | 22 | 1963 | Low | Not Rated |
| Harvey Dam Jefferson County | 26 | 2006 | Low | Not Rated |
| Hartsook Dam Ringgold County | 28 | 1998 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.