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 1001–1025 of 3,759
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Simon Run Watershed Site 9-3w Pottawattamie County | 39 | 1985 | Low | Not Rated |
| Simon Run Watershed Site 9-3e Pottawattamie County | 35 | 1985 | Low | Not Rated |
| Simon Run Watershed Site 5-2 Pottawattamie County | 30 | 1976 | Low | Not Rated |
| Simon Run Watershed Site 4-2 Pottawattamie County | 41 | 1976 | Low | Not Rated |
| Simon Dam Washington County | 31 | 2006 | Low | Not Rated |
| Simmering Dam Washington County | 25 | 1976 | Low | Not Rated |
| Silver Lake Dam Delaware County | 25 | 1948 | Low | Not Rated |
| Silver Lake Dam Worth County | 10 | — | Low | Not Rated |
| Silliman Dam Madison County | 36 | 1995 | Low | Not Rated |
| Sievers Dam Louisa County | 31 | 2004 | Low | Not Rated |
| Sievers Dam Pottawattamie County | 28 | 2003 | Low | Not Rated |
| Sievers Dam Monona County | 37 | 1965 | Low | Not Rated |
| Sietmann Dam Marshall County | 22 | 1961 | Low | Not Rated |
| Sieren Dam Keokuk County | 23 | 1977 | Low | Not Rated |
| Sieren Dam Keokuk County | 29 | 1987 | Low | Not Rated |
| Sidles Dam Appanoose County | 30 | 1984 | Low | Not Rated |
| Sickels Dam Ringgold County | 28 | 2005 | Low | Not Rated |
| Shreck Dam Ringgold County | 36 | 2000 | Low | Not Rated |
| Shreck Dam Ringgold County | 36 | 1998 | Low | Not Rated |
| Short Dam Clarke County | 35 | 1992 | Low | Not Rated |
| Shoesmith/Kalbach Dam Adair County | 26 | 1966 | Low | Not Rated |
| Shivvers Dam Marion County | 26 | 1959 | Low | Not Rated |
| Shirley Dam Fremont County | 27 | 1984 | Low | Not Rated |
| Shipley Dam Montgomery County | 31 | 2023 | Low | Not Rated |
| Shimon Marsh Dam Pocahontas County | 8 | 1990 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.