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 259
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Oak Lake Dam Kossuth County | 50 | 1971 | Significant | Satisfactory |
| Oak Hill Plantation Dam Dallas County | 32 | 2004 | Significant | Satisfactory |
| North Woods Lake Dam Decatur County | 57 | 1993 | Significant | Satisfactory |
| North Pigeon Cr Watershed Site M-1 Pottawattamie County | 62 | 1993 | Significant | Satisfactory |
| North Branch Ralston Creek Dam Johnson County | 37 | 1983 | High | Satisfactory |
| New London Country Club Dam Henry County | 26 | 1910 | Low | Satisfactory |
| Mystic Reservoir Dam Appanoose County | 31 | 1930 | Low | Satisfactory |
| Muscatine Power & Water Dam Muscatine County | 26 | 1985 | Significant | Satisfactory |
| Murguia Dam Des Moines County | 43 | 1978 | Significant | Satisfactory |
| Moulton Watershed Site A-1 Appanoose County | 31 | 1968 | Low | Satisfactory |
| Mormon Trail Lake Dam Adair County | 46 | 1965 | Low | Satisfactory |
| Moorhead Pioneer Park Dam Allamakee County | 29 | 1965 | Low | Satisfactory |
| Moorhead Pioneer Park Dam Ida County | 36 | 1966 | Low | Satisfactory |
| Monument Road Dam Pottawattamie County | 32 | 2011 | High | Satisfactory |
| Mitchell Mill Dam Mitchell County | 19 | 1925 | Low | Satisfactory |
| Mill Picayune Watershed Site N-2 Shelby County | 39 | 1972 | Significant | Satisfactory |
| Mill Picayune Watershed Site M-24-17 Shelby County | 40 | 1984 | Significant | Satisfactory |
| Mill Picayune Watershed Site M-24-14 Shelby County | 40 | 1961 | Significant | Satisfactory |
| Mill Picayune Watershed Site M-22-3 Shelby County | 37 | 1978 | Significant | Satisfactory |
| Mill Picayune Watershed Site M-21-5 Shelby County | 48 | 1980 | Significant | Satisfactory |
| Mill Picayune Watershed Site B-3 Harrison County | 38 | 1962 | High | Satisfactory |
| Mill Creek Lake Dam O'Brien County | 29 | 1934 | Low | Satisfactory |
| Mc Kinley Lake Dam Union County | 19 | 1920 | Significant | Satisfactory |
| Mc Dowel Dam #1 Lee County | 40 | 1967 | Significant | Satisfactory |
| Maquoketa Milldam Jackson County | 26 | 1923 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.