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 2626–2650 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Homepond Dam Decatur County | 30 | 1920 | Significant | Fair |
| Holste Dam Cass County | 26 | 1968 | Low | Not Rated |
| Holsapple Dam Van Buren County | 30 | 2000 | Low | Not Rated |
| Holm Dam Butler County | 20 | 1969 | Low | Not Rated |
| Holm Dam Madison County | 36 | 1972 | Low | Not Rated |
| Holland Marsh Dam Grundy County | 11 | 1997 | Low | Not Rated |
| Holiday Lake Dam Poweshiek County | 50 | 1962 | Significant | Satisfactory |
| Holesinger Dam Clinton County | 25 | 2004 | Low | Not Rated |
| Holdens Pond Dam Iowa County | 25 | 1950 | Low | Not Rated |
| Holden Dam Iowa County | 48 | 2000 | Low | Not Rated |
| Hoisington Dam Mitchell County | 8 | 2021 | Low | Not Rated |
| Hoffman Dam Ida County | 24 | 1971 | Low | Not Rated |
| Hoffman Dam Hardin County | 27 | 1994 | Low | Not Rated |
| Hoffman Dam Dubuque County | 30 | 2022 | Low | Not Rated |
| Hobbs Dam Lucas County | 8 | 2010 | Low | Not Rated |
| Hirsch Dam Madison County | 25 | 1975 | Low | Not Rated |
| Hinze Dam Fremont County | 30 | 1960 | Low | Not Rated |
| Hinrichs Dam Iowa County | 32 | 1970 | Low | Not Rated |
| Hinegardner Lake Dam Tama County | 18 | 1963 | Low | Not Rated |
| Hinebaugh Dam Decatur County | 24 | 1979 | Low | Not Rated |
| Hilleary Dam Des Moines County | 32 | 1989 | Low | Not Rated |
| Hill Dam Warren County | 25 | 1972 | Low | Not Rated |
| Hill Dam Audubon County | 28 | 1962 | Low | Not Rated |
| Hill Dam Adair County | 22 | 2002 | Low | Not Rated |
| Hildreth Dam Montgomery County | 25 | 1983 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.