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 51–75 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Wolf Creek Subwatershed Site 4-4 Woodbury County | 39 | 1991 | Low | Not Rated |
| Wolf Creek Subwatershed Site 3-2 Woodbury County | 35 | 1971 | Low | Not Rated |
| Wolf Creek Subwatershed Site 3-1 Woodbury County | 33 | 1972 | Low | Not Rated |
| Wohlers Dam Pottawattamie County | 40 | 1959 | Low | Not Rated |
| Wohlers Dam Pottawattamie County | 42 | 1961 | Low | Not Rated |
| Wm. Seymour Dam Warren County | 41 | 1981 | Low | Not Rated |
| Wittstock Dam Union County | 27 | 1977 | Low | Not Rated |
| Wise Dam Polk County | 25 | 1959 | Low | Not Rated |
| Wise Dam Woodbury County | 31 | 1967 | Low | Not Rated |
| Winther Dam Audubon County | 25 | 1968 | Low | Not Rated |
| Winner Dam Harrison County | 41 | 2011 | Low | Not Rated |
| Winkowitsch Dam Butler County | 24 | 1967 | Low | Not Rated |
| Winkler / Spies Dam Pocahontas County | 7 | 1999 | Low | Not Rated |
| Winkler Dam Wapello County | 30 | 1963 | Low | Not Rated |
| Wingert/Freymann Dam Plymouth County | 46 | 1961 | Low | Not Rated |
| Windy Hill Subwatershed Site 5b-1 Woodbury County | 47 | 1975 | Low | Not Rated |
| Windy Hill Subwatershed Site 5-4 Woodbury County | 34 | 1975 | Low | Not Rated |
| Windy Hill Subwatershed Site 5-3 Woodbury County | 52 | 1975 | Low | Not Rated |
| Windy Hill Subwatershed Site 5-1 Woodbury County | 36 | 1975 | Low | Not Rated |
| Windy Hill Subwatershed Site 3d-2 Woodbury County | 33 | 1975 | Low | Not Rated |
| Windy Hill Subwatershed Site 3a-1 Woodbury County | 34 | 1975 | Low | Not Rated |
| Windy Hill Subwatershed Site 3-2 Woodbury County | 42 | 1975 | Low | Not Rated |
| Windy Hill Subwatershed Site 2-2 Woodbury County | 33 | 1975 | Low | Not Rated |
| Windy Hill Subwatershed Site 2-1 Woodbury County | 39 | 1975 | Low | Not Rated |
| Windmill Lake Dam Taylor County | 35 | 1969 | Low | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.