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 1601–1625 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Nelson North Weland Dam Pocahontas County | 7 | 2004 | Low | Not Rated |
| Nelson Dam Cherokee County | 39 | 1996 | Low | Not Rated |
| Nelson Dam Clay County | 26 | 1999 | Low | Not Rated |
| Nelson Dam Des Moines County | 24 | 1966 | Low | Not Rated |
| Naylor Dam Mahaska County | 35 | 1971 | Low | Not Rated |
| Naurude Dam Monona County | 48 | 1967 | Low | Not Rated |
| Natural Milk Dam Shelby County | 49 | 2006 | Low | Not Rated |
| Nass Dam Monona County | 44 | 1999 | Low | Not Rated |
| Nashua Milldam Chickasaw County | 20 | 1917 | Significant | Fair |
| Nash Dam Monroe County | 27 | 1959 | Low | Not Rated |
| Napa Valley Dam Dallas County | 32 | 1988 | Significant | Fair |
| Nagel Dam Poweshiek County | 22 | 2015 | Low | Not Rated |
| Mystic Reservoir Dam Appanoose County | 31 | 1930 | Low | Satisfactory |
| Myers Dam Davis County | 21 | 2019 | Low | Not Rated |
| Muscatine Power & Water Dam Muscatine County | 26 | 1985 | Significant | Satisfactory |
| Muscatine County Roadgrade Dam 14-77-1e Muscatine County | 38 | 1971 | Significant | Fair |
| Murry Farms Dam Louisa County | 29 | 2023 | Low | Not Rated |
| Murray Dam Wayne County | 29 | 1996 | Low | Not Rated |
| Murguia Dam Des Moines County | 43 | 1978 | Significant | Satisfactory |
| Murdy Dam Appanoose County | 25 | 1973 | Low | Not Rated |
| Murchland Dam Crawford County | 36 | 1956 | Low | Not Rated |
| Munson Wrp Dam Dickinson County | 11 | 2011 | Low | Not Rated |
| Mulvihill Dam Madison County | 28 | 1998 | Low | Not Rated |
| Mullins Dam Madison County | 28 | 1970 | Low | Not Rated |
| Mullet Dam Davis County | 22 | — | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.