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 2751–2775 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Hansell Farms Dam Decatur County | 23 | 1991 | Low | Not Rated |
| Hannen Lake Dam Benton County | 35 | 1959 | Significant | Satisfactory |
| Hanna Dam Adams County | 21 | 1994 | Low | Not Rated |
| Hanlontown Slough Site 3 Worth County | 8 | 2000 | Low | Not Rated |
| Hanlontown Slough Dam 1.1 Worth County | 11 | 2001 | Low | Not Rated |
| Hankins Dam Mahaska County | 20 | 1967 | Low | Not Rated |
| Hanke Dam Jasper County | 26 | 1972 | Low | Not Rated |
| Hanigan Dam Monona County | 44 | 2001 | Low | Not Rated |
| Hang Dam Taylor County | 19 | 1969 | Low | Not Rated |
| Hamm/Knutsen Dam Wayne County | 17 | 1962 | Low | Not Rated |
| Hammes Dam Jefferson County | 30 | 2000 | Low | Not Rated |
| Hammer Dam Warren County | 28 | 2000 | Low | Not Rated |
| Hammer Dam Webster County | 50 | 1973 | Low | Not Rated |
| Hamburg Watershed Site M-1 Fremont County | 55 | 1961 | High | Satisfactory |
| Hamaker Dam Crawford County | 30 | 1961 | Low | Not Rated |
| Halverson Dam Guthrie County | 28 | 1964 | Low | Not Rated |
| Hallquist Dam Montgomery County | 28 | 2009 | Low | Not Rated |
| Hallquist Dam Montgomery County | 34 | 2022 | Low | Not Rated |
| Halliday Dam Page County | 30 | 1972 | Low | Not Rated |
| Hall Dam Boone County | 37 | 1996 | Low | Not Rated |
| Hallbrook Pond Dam Dallas County | 17 | 2009 | Significant | Satisfactory |
| Hale Dam Wapello County | 24 | 1983 | Low | Not Rated |
| Hainline Dam Ringgold County | 31 | 1996 | Low | Not Rated |
| Haines Dam Adair County | 23 | 1970 | Low | Not Rated |
| Hahn/Linnenkamp Dam Keokuk County | 29 | 1966 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.