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 3326–3350 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Sundown Lake North Sediment Basin Appanoose County | 32 | 2018 | Low | Not Rated |
| Sunrise Lake Dam Washington County | 18 | 1963 | Low | Not Rated |
| Sunrise Subwatershed Site 6-1 Woodbury County | 47 | 1973 | Low | Not Rated |
| Sunrise Subwatershed Site 6a-1 Woodbury County | 52 | 1973 | Low | Not Rated |
| Sunrise Subwatershed Site 7-1 Woodbury County | 32 | — | Low | Not Rated |
| Sun Valley Lake Dam Ringgold County | 67 | 1971 | Significant | Satisfactory |
| Sun Valley Lake Sediment Basin Ringgold County | 40 | 2019 | Significant | Not Rated |
| Sutton Dam Benton County | 20 | 1988 | Low | Not Rated |
| Swaim Dam Davis County | 36 | 2016 | Low | Not Rated |
| Swaim Dam Davis County | 20 | 1999 | Low | Not Rated |
| Swan Dam Jefferson County | 22 | 2004 | Low | Not Rated |
| Swanger Dam Woodbury County | 42 | 1970 | Low | Not Rated |
| Swan Lake Dam Carroll County | 10 | 1935 | Low | Not Rated |
| Swanson Dam Warren County | 37 | 1969 | Low | Not Rated |
| Swanson Dam Scott County | 25 | 1971 | Low | Not Rated |
| Sw Branch Dry Run Creek Stormwater Detention Dam Black Hawk County | 17 | 2003 | High | Satisfactory |
| Swigart Dam Ringgold County | 22 | 1979 | Low | Not Rated |
| Swine Graphics #1 Clarke County | 44 | 2000 | Low | Not Rated |
| Swine Graphics Dam #2 Clarke County | 47 | 2005 | Low | Not Rated |
| Swiss Lake Estates Dam Fayette County | 44 | 1967 | Low | Fair |
| Talmage Hill Dam Union County | 25 | 1985 | Low | Not Rated |
| Tapken Dam Adair County | 28 | 1976 | Low | Not Rated |
| Taplin Dam Clinton County | 28 | 1999 | Low | Not Rated |
| Tate Dam Crawford County | 38 | 1958 | Low | Not Rated |
| Taylor 1 Dam Fremont County | 29 | 1963 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.