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 2426–2450 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Jansen Dam Jasper County | 24 | 2006 | Low | Not Rated |
| Jandik Dam Warren County | 37 | 2000 | Low | Not Rated |
| James Russmann Dam Pottawattamie County | 24 | 2016 | Low | Not Rated |
| James King Wetland Dam Muscatine County | 11 | 1999 | Low | Not Rated |
| James Dam Warren County | 30 | 1979 | Low | Not Rated |
| Jalas Dam O'Brien County | 34 | 1965 | Low | Not Rated |
| Jaeschke Dam Clarke County | 33 | 1976 | Low | Not Rated |
| Jacobson Dam Crawford County | 36 | 1963 | Low | Not Rated |
| Jackson Dam Montgomery County | 34 | 2022 | Low | Not Rated |
| Jackson Dam Wayne County | 43 | 1994 | Low | Not Rated |
| Izzak Walton League Dam Wapello County | 35 | 1965 | Significant | Satisfactory |
| Izaak Walton Lake Dam Des Moines County | 22 | 1921 | Significant | Satisfactory |
| Isu Dam Lucas County | 24 | 1958 | Low | Not Rated |
| Isu Dam Story County | 37 | 1958 | Low | Not Rated |
| Israel Dam Taylor County | 29 | 1981 | Low | Not Rated |
| Iris Lake Dam Fayette County | 66 | 2004 | Low | Satisfactory |
| Iowa Select Farms Dam Union County | 40 | 1997 | Low | Not Rated |
| Iowa Noname97 Johnson County | 31 | 1991 | Low | Not Rated |
| Iowa Noname96 Wayne County | 33 | 1980 | Low | Not Rated |
| Iowa Noname95 Wayne County | 36 | 1980 | Low | Not Rated |
| Iowa Noname94 Wayne County | 30 | 1980 | Low | Not Rated |
| Iowa Noname93 Keokuk County | 31 | 1980 | Low | Not Rated |
| Iowa Noname92 Keokuk County | 25 | 1980 | Low | Not Rated |
| Iowa Noname91 Des Moines County | 29 | 1980 | Low | Not Rated |
| Iowa Noname90 Jasper County | 14 | 1979 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.