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 1351–1375 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Prairie Trail Development - South Dam Polk County | 31 | 2008 | Significant | Not Rated |
| Prairie Trail Development - North Dam Polk County | 22 | 2008 | Significant | Not Rated |
| Prairie Trail - Cp5 Polk County | 24 | 2014 | Significant | Not Rated |
| Prairie Rose Lake Dam Shelby County | 55 | 1960 | Significant | Satisfactory |
| Powers Dam Mills County | 41 | 1960 | Low | Not Rated |
| Pottorff Dam Adams County | 26 | 1999 | Low | Not Rated |
| Pottawattamie CO Roadgrade Dam 8-76-42 Pottawattamie County | 43 | 1968 | Low | Not Rated |
| Posten Dam Page County | 39 | 1975 | Low | Not Rated |
| Possehl Dam Monroe County | 33 | 1989 | Low | Not Rated |
| Porter Dam Davis County | 26 | 2002 | Low | Not Rated |
| Porter Dam Polk County | 25 | 1955 | Low | Not Rated |
| Pony Creek Watershed Site 9 Mills County | 60 | 1967 | Low | Not Rated |
| Pony Creek Watershed Site 8a Mills County | 62 | 1966 | Low | Not Rated |
| Pony Creek Watershed Site 7 Mills County | 30 | 1965 | Low | Not Rated |
| Pony Creek Watershed Site 6u Mills County | 24 | 1965 | Low | Not Rated |
| Pony Creek Watershed Site 34 Mills County | 46 | 1963 | Low | Not Rated |
| Pony Creek Watershed Site 31 Mills County | 38 | 1963 | Low | Not Rated |
| Pony Creek Watershed Site 30 Mills County | 49 | 1964 | Significant | Satisfactory |
| Pony Creek Watershed Site 26 Mills County | 37 | 1963 | Low | Not Rated |
| Pony Creek Watershed Site 24 Mills County | 40 | 1964 | Low | Not Rated |
| Pony Creek Watershed Site 23 Mills County | 64 | 1964 | Low | Not Rated |
| Pony Creek Watershed Site 22 Mills County | 48 | 1963 | Low | Not Rated |
| Pony Creek Watershed Site 21 Mills County | 75 | 1971 | High | Satisfactory |
| Pony Creek Watershed Site 20 Mills County | 48 | 1965 | Low | Not Rated |
| Pony Creek Watershed Site 17 Mills County | 62 | 1965 | Low | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.