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 1176–1200 of 3,759
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Greenberg Dam Ringgold County | 22 | 1997 | Low | Not Rated |
| Greencrest Farms Dam Adair County | 37 | 1976 | Low | Not Rated |
| Green Dam Polk County | 30 | 1961 | Low | Not Rated |
| Green Dam Clarke County | 25 | 1972 | Low | Not Rated |
| Greene County Dam Greene County | 34 | 1984 | Low | Not Rated |
| Greene County Roadgrade Dam 28-85-32 Greene County | 30 | 1986 | Low | Not Rated |
| Greene County Wetland Dam #1 Greene County | 9 | 2006 | Low | Not Rated |
| Greene Mill Dam Butler County | 11 | 1925 | Low | Satisfactory |
| Greenfield Dam Jefferson County | 35 | 1998 | Low | Not Rated |
| Greenland Dam Ringgold County | 33 | 1999 | Low | Not Rated |
| Greenlee Dam Wayne County | 18 | 2000 | Low | Not Rated |
| Greenwood Dam Harrison County | 34 | 1996 | Low | Not Rated |
| Greg Gilbert Dam Clarke County | 32 | 2019 | Low | Not Rated |
| Gregory, INC. Dam Lee County | 36 | 1996 | Low | Not Rated |
| Greg Rodgers Dam Davis County | 26 | 2011 | Low | Not Rated |
| Greiner Dam Washington County | 29 | 2005 | Low | Not Rated |
| Greiner Dam Washington County | 32 | 2002 | Low | Not Rated |
| Greiner Dam Wapello County | 21 | 1968 | Low | Not Rated |
| Greiner Dam Tama County | 28 | 1975 | Low | Not Rated |
| Greiner/Vogel Dam Washington County | 25 | 1965 | Low | Not Rated |
| Greogory Dam Taylor County | 21 | 1959 | Low | Not Rated |
| Greubel Dam Warren County | 26 | 1962 | Low | Not Rated |
| G&R Farms Dam Washington County | 35 | 1977 | Low | Not Rated |
| Griener Dam Keokuk County | 30 | 1975 | Low | Not Rated |
| Griener Dam Keokuk County | 39 | 1975 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.