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 326–350 of 3,759
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Black Dam Story County | 42 | 1980 | Low | Not Rated |
| Black Dam Lucas County | 30 | 1976 | Low | Not Rated |
| Blackford Dam Wayne County | 16 | 1998 | Low | Not Rated |
| Black Hawk Marsh Dam Sac County | 8 | 1994 | Low | Not Rated |
| Blackwell Dam Davis County | 23 | 1958 | Low | Not Rated |
| Blair - Stoelk Dam Crawford County | 29 | 2001 | Low | Not Rated |
| Blanchard Dam Lee County | 37 | 2006 | Low | Not Rated |
| Block Dam Crawford County | 34 | 1967 | Low | Not Rated |
| Blockton Watershed Site A-1 Taylor County | 33 | 1973 | Low | Not Rated |
| Blockton Watershed Site A-2 Taylor County | 27 | 1973 | Low | Not Rated |
| Blockton Watershed Site A-3 Taylor County | 23 | 1966 | Low | Not Rated |
| Blockton Watershed Site E-1 Taylor County | 30 | 1973 | Low | Not Rated |
| Blockton Watershed Site E-2 Taylor County | 34 | 1973 | Low | Not Rated |
| Blockton Watershed Site E-3 Taylor County | 36 | 1973 | Low | Not Rated |
| Blockton Watershed Site J-1 Taylor County | 28 | 1966 | Low | Not Rated |
| Blockton Watershed Site K-1 Taylor County | 28 | 1973 | Low | Not Rated |
| Blockton Watershed Site S-1 Taylor County | 24 | 1966 | Low | Not Rated |
| Blockton Watershed Site S-10 Taylor County | 25 | 1966 | Low | Not Rated |
| Blockton Watershed Site S-2 Taylor County | 27 | 1987 | Low | Not Rated |
| Blockton Watershed Site S-7 Taylor County | 23 | 1970 | Low | Not Rated |
| Blockton Watershed Site S-8 Taylor County | 18 | 1966 | Low | Not Rated |
| Blockton Watershed Site S-9 Taylor County | 30 | 1973 | Low | Not Rated |
| Blockton Watershed Site T-1 Taylor County | 26 | 1969 | Low | Not Rated |
| Blockton Watershed Site V-1 Taylor County | 32 | 1966 | Low | Not Rated |
| Blockton Watershed Site W-2 Taylor County | 25 | 1970 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.