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 2826–2850 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Greenbriar Dam Dallas County | 52 | 1972 | Significant | Satisfactory |
| Greenberg Dam Ringgold County | 22 | 1997 | Low | Not Rated |
| Greenbelt Wetland Dam Lucas County | 7 | 1994 | Low | Not Rated |
| Green Acres Dam Lee County | 26 | 1971 | Low | Not Rated |
| Green Acres Dam Audubon County | 25 | 1969 | Low | Not Rated |
| Gray Dam Page County | 30 | 2021 | Low | Not Rated |
| Gray Dam Tama County | 25 | 1946 | Low | Not Rated |
| Gray Dam Montgomery County | 39 | 1989 | Low | Not Rated |
| Gray Dam Tama County | 27 | 1964 | Low | Not Rated |
| Grau Dam Crawford County | 34 | 1945 | Low | Not Rated |
| Grap Dam Harrison County | 29 | 2011 | Low | Not Rated |
| Granfield/Westrum Dam Union County | 28 | 1977 | Low | Not Rated |
| Grand River Cattle Dam Decatur County | 41 | 2007 | Low | Not Rated |
| Grand Meadow Subwatershed Site M-2 Cherokee County | 24 | 1966 | Low | Not Rated |
| Grand Meadow Subwatershed Site M-1 Cherokee County | 21 | 1966 | Low | Not Rated |
| Grand Meadow Subwatershed Site 8-3 Cherokee County | 20 | 1966 | Low | Not Rated |
| Granaman Dam Wapello County | 23 | 2015 | Low | Not Rated |
| Graham Dam Warren County | 25 | 1968 | Low | Not Rated |
| Graettinger Dam Palo Alto County | 30 | 1972 | Low | Not Rated |
| Grade Lake Dam Clarke County | 44 | 1900 | High | Satisfactory |
| Graceland College Dam Decatur County | 12 | 1959 | Low | Not Rated |
| Gothier No.2 Subwatershed M-10840 Woodbury County | 35 | 1964 | Low | Not Rated |
| Gothier No.2 Subwatershed 14115 Woodbury County | 24 | 1964 | Low | Not Rated |
| Gosch Dam Monona County | 31 | 1964 | Low | Not Rated |
| Gordin Dam Marion County | 27 | 1995 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.