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 101–125 of 274
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Holiday Lake Dam Poweshiek County | 50 | 1962 | Significant | Satisfactory |
| Homepond Dam Decatur County | 30 | 1920 | Significant | Fair |
| Hon Dam Muscatine County | 19 | 1991 | Significant | Fair |
| Hooper Dam Warren County | 37 | 1996 | Significant | Satisfactory |
| Horse Lake Dam Plymouth County | 67 | 1963 | Significant | Satisfactory |
| Horseshoe Cove Dam Guthrie County | 32 | 1975 | Significant | Poor |
| Hudnutt Dam Poweshiek County | 28 | 1972 | Significant | Not Rated |
| Humeston Reservoir Dam Wayne County | 31 | 1916 | Significant | Poor |
| Ilex Dam Polk County | 10 | 1980 | Significant | Not Rated |
| Indian Creek-Van Buren Watershed Site 27 Van Buren County | 36 | 1990 | Significant | Satisfactory |
| Iowa Falls Milldam Hardin County | 26 | 1925 | Significant | Fair |
| Iowa Noname35 Plymouth County | 35 | 1967 | Significant | Not Rated |
| Iowa Noname60 Woodbury County | 29 | 1964 | Significant | Not Rated |
| Izaak Walton Lake Dam Des Moines County | 22 | 1921 | Significant | Satisfactory |
| Izzak Walton League Dam Wapello County | 35 | 1965 | Significant | Satisfactory |
| Jester Park Estates Dam Polk County | 11 | 2005 | Significant | Satisfactory |
| John Deere Davenport Works Dam Scott County | 24 | 1975 | Significant | Satisfactory |
| John Deere Tcao Dam Black Hawk County | 15 | 1980 | Significant | Satisfactory |
| Johnston Dam Jasper County | 30 | 2005 | Significant | Not Rated |
| Jordan Creek Mall - Northwest Dam Dallas County | 17 | 2006 | Significant | Satisfactory |
| Jordan Creek Mall - South Dam Dallas County | 17 | 2006 | Significant | Satisfactory |
| Jsc Farms Dam Dallas County | 49 | 1995 | Significant | Satisfactory |
| Kennedy & Johns Dam Plymouth County | 40 | 1975 | Significant | Not Rated |
| Kincart Farms Dam Davis County | 25 | 1975 | Significant | Not Rated |
| Lake Ahquabi Dam Warren County | 43 | 1935 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.