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 876–900 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Sponsler Dam Wayne County | 20 | 1961 | Low | Not Rated |
| Split Rock Dam Chickasaw County | 25 | 1964 | Low | Not Rated |
| Spillers Dam Dallas County | 28 | 1962 | Low | Not Rated |
| Spencer Dam Pottawattamie County | 33 | 1966 | Low | Not Rated |
| Spencer Dam Harrison County | 47 | 2007 | Low | Not Rated |
| Spence Dam Warren County | 32 | 2003 | Low | Not Rated |
| Speck Dam Mills County | 34 | 2004 | Low | Not Rated |
| Sparks Dam Woodbury County | 23 | 1964 | Low | Not Rated |
| Southwest Iowa Egg Cooperative Dam Cass County | 38 | 1999 | Low | Not Rated |
| Southridge Road Detention Basin Marshall County | 18 | 1996 | Significant | Satisfactory |
| South Ridge Estates - West Dam Sioux County | 8 | 2007 | Significant | Not Rated |
| South Ridge Estates - South Dam Sioux County | 11 | 2007 | Significant | Not Rated |
| South Ridge Estates - East Dam Sioux County | 17 | 2007 | High | Satisfactory |
| Southpoint Wetland Mitigation Dam Polk County | 15 | 2004 | Low | Satisfactory |
| South Magnolia Watershed Site Z Harrison County | 44 | 1958 | Low | Not Rated |
| South Magnolia Watershed Site 5 Harrison County | 37 | 1958 | Low | Not Rated |
| South Magnolia Watershed Site 4 Harrison County | 34 | 1958 | Low | Not Rated |
| South Magnolia Watershed Site 3 Harrison County | 28 | 1958 | Low | Not Rated |
| South Magnolia Watershed Site 1 Harrison County | 57 | 1958 | Low | Not Rated |
| South Lake Dam Linn County | 28 | 1993 | Low | Not Rated |
| South Hungerford 2 Watershed Site 9 Plymouth County | 25 | 1976 | Low | Not Rated |
| South Hungerford 2 Watershed Site 8 Plymouth County | 26 | 1976 | Low | Not Rated |
| South Hungerford 2 Watershed Site 5 Plymouth County | 28 | 1967 | Low | Not Rated |
| South Hungerford 2 Watershed Site 4 Plymouth County | 27 | 1965 | Low | Not Rated |
| South Hungerford 2 Watershed Site 11 Plymouth County | 40 | 1964 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.