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 2051–2075 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Lowary Dam Henry County | 26 | 2008 | Low | Not Rated |
| Lounsberry Dam Monona County | 35 | 1975 | Low | Not Rated |
| Louisa County Roadgrade Dam 24-74-3 Louisa County | 28 | 1989 | Low | Not Rated |
| Louisa County Raodgrade Dam 36-73-3 Louisa County | 40 | 2002 | Low | Not Rated |
| Lost Grove Lake Scott County | 75 | 2012 | High | Satisfactory |
| Lorenzen Dam Clinton County | 33 | 1998 | Low | Not Rated |
| Lorenz Dam Henry County | 28 | 2012 | Low | Not Rated |
| Longinaker Dam Fremont County | 27 | 1965 | Low | Not Rated |
| Long Dam Warren County | 41 | 1967 | Low | Not Rated |
| Logsdon Dam Lucas County | 19 | 1996 | Low | Not Rated |
| Logan Dam Davis County | 31 | 1998 | Low | Not Rated |
| Logan Dam Davis County | 21 | 1999 | Low | Not Rated |
| Loewe Dam Fremont County | 27 | 1985 | Low | Not Rated |
| Loch Burns Dam Wapello County | 30 | 1963 | Low | Fair |
| Livingston Dam Taylor County | 31 | 1974 | Low | Not Rated |
| Little Whiskey Subwatershed Site M-2 Woodbury County | 42 | 1990 | Significant | Satisfactory |
| Little Whiskey Subwatershed Site M-1 Woodbury County | 37 | 1984 | Low | Not Rated |
| Little Whiskey Subwatershed Site 16-2 Woodbury County | 36 | 2001 | Low | Not Rated |
| Littleton Dam Buchanan County | 9 | 1934 | Low | Not Rated |
| Little Sioux Scout Ranch Dam Monona County | 46 | 1974 | Low | Not Rated |
| Little Sioux River Bedgrade Control Harrison County | 8 | 1985 | Low | Not Rated |
| Little Sioux Dam Harrison County | 7 | 1963 | Low | Not Rated |
| Little River Watershed Site M-1 Decatur County | 61 | 1984 | High | Satisfactory |
| Little River Watershed Site 65-3 Decatur County | 22 | 1980 | Significant | Satisfactory |
| Little River Watershed Site 65-2 Decatur County | 30 | 1980 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.