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 2601–2625 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Horse Lake Dam Plymouth County | 67 | 1963 | Significant | Satisfactory |
| Horras Dam Jefferson County | 24 | 1995 | Low | Not Rated |
| Hopp Dam (Upper Site) Mills County | 36 | 2005 | Low | Not Rated |
| Hopp Dam (Lower Site) Mills County | 30 | 2005 | Low | Not Rated |
| Hopp Dam Crawford County | 27 | 2006 | Low | Not Rated |
| Hopkinton Milldam Delaware County | 10 | 1925 | Low | Not Rated |
| Hopkins Dam Davis County | 27 | 1972 | Low | Not Rated |
| Hopkins Dam Fremont County | 37 | 1959 | Low | Not Rated |
| Hopkins Dam Davis County | 30 | 1962 | Low | Not Rated |
| Hooper Dam Warren County | 37 | 1996 | Significant | Satisfactory |
| Honey Creek Watershed Site K-1 Lucas County | 28 | 1956 | Low | Not Rated |
| Honey Creek Watershed Site J-4-A Lucas County | 26 | 1956 | Low | Not Rated |
| Honey Creek Watershed Site J-3 Lucas County | 25 | 1956 | Low | Not Rated |
| Honey Creek Watershed Site J-1 Lucas County | 25 | 1955 | Low | Not Rated |
| Honey Creek Watershed Site H-3 Lucas County | 24 | 1955 | Low | Not Rated |
| Honey Creek Watershed Site H-2 Lucas County | 25 | 1955 | Low | Not Rated |
| Honey Creek Watershed Site E-1 Lucas County | 22 | 1955 | Low | Not Rated |
| Honey Creek Watershed Site D-6 Lucas County | 24 | 1955 | Low | Not Rated |
| Honey Creek Watershed Site C-7 Lucas County | 27 | 1954 | Low | Not Rated |
| Honey Creek Watershed Site A-4 Lucas County | 24 | 1957 | Low | Not Rated |
| Honey Creek Watershed Site A-3 Lucas County | 19 | 1955 | Low | Not Rated |
| Honey Creek Watershed Site A-2 Lucas County | 22 | 1956 | Low | Not Rated |
| Honey Creek F-1 Lucas County | 28 | 1955 | Low | Not Rated |
| Honey Creek F-1 Lucas County | 28 | 1955 | Low | Not Rated |
| Hon Dam Muscatine County | 19 | 1991 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.