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 1226–1250 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Gegner Dam Madison County | 31 | 1999 | Low | Satisfactory |
| Gehring Dam Linn County | 28 | 2007 | Significant | Satisfactory |
| General Manufacturing Dam Warren County | 31 | 1995 | Low | Not Rated |
| Gennaro Dam Union County | 26 | 2006 | Low | Not Rated |
| Gentleman Dam Appanoose County | 30 | 1987 | Low | Not Rated |
| Geode Lake Dam Des Moines County | 59 | 1949 | Significant | Satisfactory |
| Gerdner Dam Des Moines County | 25 | 1945 | Low | Not Rated |
| Gerlach Dam Buena Vista County | 31 | 1978 | Low | Not Rated |
| Gerot Dam Louisa County | 28 | 1999 | Low | Not Rated |
| Gesicki Dam Appanoose County | 31 | 1987 | Low | Not Rated |
| Getter Dam Adams County | 34 | 1974 | Low | Not Rated |
| Gibbs Dam Adair County | 21 | 1967 | Low | Not Rated |
| Gibbs Dam Adair County | 20 | 1959 | Low | Not Rated |
| Gibson South - Dredge Spoil Disposal Guthrie County | 95 | 1999 | Significant | Satisfactory |
| Giesking Dam Tama County | 18 | 2022 | Low | Not Rated |
| Giffin Dam Des Moines County | 32 | 1965 | Low | Not Rated |
| Gilchrist Dam Van Buren County | 25 | 2000 | Low | Not Rated |
| Gillette-Schoning-Ammerman Dam Franklin County | 13 | 2011 | Low | Not Rated |
| Gilliand Dam Washington County | 32 | 1972 | Low | Not Rated |
| Gleich Dam Wapello County | 31 | 1990 | Low | Not Rated |
| Glen Ellen Subwatershed Site 2-2 Woodbury County | 25 | 1963 | Significant | Fair |
| Glen Ellen Subwatershed Site 3-1 Woodbury County | 29 | 1963 | High | Satisfactory |
| Glen Ellen Subwatershed Site 3-2 Woodbury County | 32 | 1963 | High | Fair |
| Glen Oaks Country Club Dam Polk County | 36 | 1950 | High | Satisfactory |
| Glissman Dam Dallas County | 37 | 1969 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.