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 2551–2575 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Niacc Dam Cerro Gordo County | 24 | 1973 | Low | Not Rated |
| Nice/Crumly Dam Muscatine County | 35 | 1969 | Low | Not Rated |
| Nichols Dam Adair County | 23 | 1974 | Low | Not Rated |
| Nichols Dam Warren County | 28 | 1992 | Low | Not Rated |
| Nicholson Dam Taylor County | 30 | 1991 | Low | Not Rated |
| Niebuhr Dam Monroe County | 33 | 2000 | Low | Not Rated |
| Nikkel Dam Poweshiek County | 29 | 1990 | Low | Not Rated |
| Nikkel Dam Poweshiek County | 27 | 1976 | Low | Not Rated |
| Nilan Dam Pottawattamie County | 30 | 1962 | Low | Not Rated |
| Nine Eagles Park Lake Dam Decatur County | 53 | 1930 | Significant | Fair |
| Nodaway Lake Dam Adair County | 35 | 1936 | Significant | Fair |
| Noelck Dam Franklin County | 28 | 2004 | Low | Not Rated |
| Noel Dam Appanoose County | 9 | 1998 | Low | Not Rated |
| Nora Springs Low Head Dam Floyd County | 12 | 1895 | Low | Not Rated |
| Norelius Dam Crawford County | 27 | 1997 | Low | Not Rated |
| Norlin Dam Jones County | 30 | 2000 | Low | Not Rated |
| Norlund 1 Crawford County | 19 | 2005 | Low | Not Rated |
| Norman Cook Dam Clarke County | 28 | 2020 | Low | Not Rated |
| Norman Dam Lucas County | 24 | 1958 | Low | Not Rated |
| North Branch Ralston Creek Dam Johnson County | 37 | 1983 | High | Satisfactory |
| Northeast Lake Dam Scott County | 26 | 1972 | Low | Not Rated |
| Northfork Recreational Territories Dam Allamakee County | 12 | 1995 | Low | Not Rated |
| North Iowa Comm. College Dam Cerro Gordo County | 25 | 1984 | Low | Not Rated |
| North Panama Dam Shelby County | 20 | — | Low | Not Rated |
| North Pigeon Cr Watershed Site 10-1 Pottawattamie County | 59 | 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.