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 801–825 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Sumner Dam Guthrie County | 29 | 1974 | Low | Not Rated |
| Summit Lake Dam Union County | 26 | 1935 | Low | Satisfactory |
| Sulsberger Dam Woodbury County | 31 | 1959 | Low | Not Rated |
| Sulentic Dam Pottawattamie County | 38 | 2002 | Low | Not Rated |
| Sugar Creek Lake Dam Dallas County | 19 | 1963 | Low | Not Rated |
| Stutzman Dam Washington County | 50 | 1970 | Low | Not Rated |
| Stump Lake Des Moines County | 29 | 1941 | Low | Satisfactory |
| Stump Dam Tama County | 25 | 1964 | Low | Not Rated |
| Studer Dam Taylor County | 29 | 2001 | Low | Not Rated |
| St. Thomas More Silt Dam Guthrie County | 35 | 1995 | Low | Not Rated |
| Strunk Dam Lee County | 41 | 1900 | Low | Not Rated |
| Strotenbecker Dam Mills County | 36 | 1960 | Low | Not Rated |
| Stroburg Dam Adair County | 33 | 1967 | Low | Not Rated |
| Stroburg Dam Taylor County | 31 | 1965 | Low | Not Rated |
| Stratton Dam Story County | 39 | 1976 | Low | Not Rated |
| Strathman Dam Davis County | 27 | 1999 | Low | Not Rated |
| Straight Dam Harrison County | 39 | 2011 | Low | Not Rated |
| Storm Lake - Northeast Dredge Spoil Disposal Dam Buena Vista County | 49 | 2005 | High | Satisfactory |
| Storm Lake Dredge Spoil Dam - Central Structure Buena Vista County | 24 | 2002 | Significant | Not Rated |
| Stoppelmoor Dam Johnson County | 24 | 1974 | Low | Not Rated |
| Stoner Dam Fremont County | 40 | 1959 | Low | Not Rated |
| Stone Dam Louisa County | 36 | 1988 | Low | Not Rated |
| Stoeffer Dam Story County | 27 | 1987 | Low | Not Rated |
| Stober Dam Davis County | 22 | 2000 | Low | Not Rated |
| Stimson Farms Dam Page County | 34 | 2021 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.