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 1–25 of 259
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Aegon Dam Linn County | 26 | 1997 | High | Satisfactory |
| Afton Reservoir Dam Union County | 51 | 1936 | Significant | Satisfactory |
| Ames Basin #2 Story County | 13 | 1985 | High | Satisfactory |
| Ames Basin #3 Story County | 10 | 1985 | High | Satisfactory |
| Ames Basin #4 Story County | 12 | 1985 | High | Satisfactory |
| Anamosa Jones County | 12 | 1909 | Low | Satisfactory |
| Arbor Valley Lake Dam Clarke County | 58 | 2008 | High | Satisfactory |
| Backbone Dam Delaware County | 33 | 1938 | Significant | Satisfactory |
| Bacon Creek Watershed Site A-2-4 Woodbury County | 51 | 1979 | High | Satisfactory |
| Bacon Creek Watershed Site A-3 Woodbury County | 69 | 1978 | High | Satisfactory |
| Bacon Creek Watershed Site A-3-1 Woodbury County | 50 | 1978 | High | Satisfactory |
| Bacon Creek Watershed Site C-1 Woodbury County | 41 | 1976 | High | Satisfactory |
| Bacon Creek Watershed Site H-1 Woodbury County | 54 | 1984 | Significant | Satisfactory |
| Bacon Creek Watershed Site H-1-3 Woodbury County | 40 | 1981 | Significant | Satisfactory |
| Bacon Creek Watershed Site H-2-1 Woodbury County | 59 | 1981 | Significant | Satisfactory |
| Bacon Creek Watershed Site H-2-2 Woodbury County | 51 | 1981 | Significant | Satisfactory |
| Bacon Creek Watershed Site H-3-1 Woodbury County | 55 | 1984 | Significant | Satisfactory |
| Bacon Creek Watershed Site H-3-2 Woodbury County | 46 | 1984 | Significant | Satisfactory |
| Bacon Creek Watershed Site J-1 Woodbury County | 46 | 1984 | Significant | Satisfactory |
| Bacon Creek Watershed Site J-3 Woodbury County | 53 | 1989 | Significant | Satisfactory |
| Badger Creek Watershed Site 19-5 Madison County | 32 | 1974 | Significant | Satisfactory |
| Badger Creek Watershed Site M-1-A Madison County | 46 | 1980 | Significant | Satisfactory |
| Ballard Country Club Dam Story County | 33 | 1974 | Low | Satisfactory |
| Bamboo Ridge Lake Black Hawk County | 20 | 2012 | High | Satisfactory |
| Bays Branch Guthrie County | 19 | 1962 | Significant | Satisfactory |
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.