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 1051–1075 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Skeens Pond Warren County | 34 | 2017 | Low | Not Rated |
| Siverly Dam Ringgold County | 25 | 1996 | Low | Not Rated |
| Sioux Rapids Golf Club Dam Buena Vista County | 41 | 1980 | Low | Not Rated |
| Sinnwell Dam Madison County | 27 | 1987 | Low | Not Rated |
| Singer Dam Jefferson County | 27 | 1963 | Low | Not Rated |
| Sinclair Dam Wayne County | 28 | 1977 | Low | Not Rated |
| Sims Dam Lucas County | 36 | 1988 | Low | Not Rated |
| Simpson Dam Decatur County | 28 | 1991 | Low | Not Rated |
| Simpson Creek Watershed Site 5 Fremont County | 36 | 1958 | Low | Not Rated |
| Simpson Creek Watershed Site 4 Fremont County | 41 | 1958 | Low | Not Rated |
| Simpson Creek Watershed Site 1 Fremont County | 46 | 1958 | Low | Not Rated |
| Simonson Dam Palo Alto County | 24 | 1965 | Low | Not Rated |
| Simonsen Subwatershed Sta 142+42 Main Cherokee County | 33 | 1952 | Low | Not Rated |
| Simonsen Subwatershed Sta 123+48 Main Cherokee County | 33 | 1952 | Low | Not Rated |
| Simonsen Subwatershed Lat B Sta 64+20 Cherokee County | 28 | 1952 | Low | Not Rated |
| Simonsen Subwatershed Lat A Sta20+00 Cherokee County | 32 | 1952 | Low | Not Rated |
| 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 Worth County | 10 | — | Low | Not Rated |
| Silver Lake Dam Delaware County | 25 | 1948 | Low | Not Rated |
| Silliman Dam Madison County | 36 | 1995 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.