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 76–100 of 3,759
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Willow Lake Dam Harrison County | 31 | 1976 | Low | Not Rated |
| Willow Creek Subwatershed Site M-4 Woodbury County | 25 | 1968 | Low | Not Rated |
| Willow Creek Subwatershed Site M-3 Woodbury County | 30 | 1968 | Low | Not Rated |
| Willow Creek Subwatershed Site M-2 Woodbury County | 38 | 1968 | Low | Not Rated |
| Willow Creek Subwatershed Site M-1 Woodbury County | 45 | 1968 | Low | Not Rated |
| Willow Creek Subwatershed Site 3-1 Woodbury County | 39 | 1968 | Low | Not Rated |
| Willow Creek Subwatershed Site 10-3 Woodbury County | 34 | 1968 | Low | Satisfactory |
| Williamson Pond Dam Lucas County | 32 | 1915 | Low | Not Rated |
| Williamson Dam Appanoose County | 30 | 1995 | Low | Not Rated |
| Williamson Dam Appanoose County | 27 | 1987 | Low | Not Rated |
| Williams Dam Montgomery County | 35 | 2006 | Low | Not Rated |
| Williams Dam Page County | 37 | 1969 | Low | Not Rated |
| Williams Dam Lee County | 29 | 1977 | Low | Not Rated |
| Williams Dam Plymouth County | 35 | 1962 | Low | Not Rated |
| Williams Dam Pottawattamie County | 21 | 1994 | Low | Not Rated |
| Williams Dam Davis County | 32 | 2000 | Low | Not Rated |
| Williams Dam Page County | 40 | 1966 | Low | Not Rated |
| Williams Dam Adair County | 30 | 2003 | Low | Not Rated |
| Williams Dam Clarke County | 34 | 2010 | Low | Not Rated |
| William Ory Dam Madison County | 31 | 2018 | Low | Not Rated |
| Wilkinson Dam Poweshiek County | 27 | 1981 | Low | Not Rated |
| Wilkinson Dam Poweshiek County | 29 | 2005 | Low | Not Rated |
| Wilhelmi Dam Dallas County | 30 | 2002 | Low | Not Rated |
| Wiley Dam Warren County | 25 | 1964 | Low | Not Rated |
| Wildwood Hill Dam Madison County | 26 | 1961 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.