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 2276–2300 of 3,759
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Nepper Subwatershed Site 3348 Monona County | 32 | 1948 | Low | Not Rated |
| Nepper Subwatershed Site M-5700 Monona County | 43 | 1948 | Low | Not Rated |
| Nepple Dam Davis County | 27 | 2000 | Low | Not Rated |
| Neumann & Hunter Dam Adair County | 26 | 1969 | Low | Not Rated |
| Neustrom Subwatershed Site 11-1 Woodbury County | 32 | 1977 | Low | Not Rated |
| Neustrom Subwatershed Site 11-2 Woodbury County | 37 | 1977 | Low | Not Rated |
| Neustrom Subwatershed Site 13-1 Woodbury County | 47 | 1971 | Low | Not Rated |
| Neustrom Subwatershed Site 13-2 Woodbury County | 39 | 1971 | Low | Not Rated |
| Neustrom Subwatershed Site 17-2 Woodbury County | 39 | 1971 | Low | Not Rated |
| Neustrom Subwatershed Site 19-3 Woodbury County | 40 | 1973 | Low | Not Rated |
| Neustrom Subwatershed Site 9-3 Woodbury County | 50 | 1971 | Low | Not Rated |
| Neustrom Subwatershed Site M-1 Woodbury County | 30 | 1971 | Low | Not Rated |
| Neustrom Subwatershed Site M-3 Woodbury County | 25 | 1971 | Low | Not Rated |
| Neustrom Subwatershed Site M-4 Woodbury County | 48 | 1971 | Low | Not Rated |
| Neustrom Subwatershed Site M-5 Woodbury County | 39 | 1971 | Low | Not Rated |
| Neustrom Subwatershed Site M-6 Woodbury County | 33 | 1971 | Low | Not Rated |
| Neva Anderson Trust Dam Montgomery County | 33 | 2021 | Low | Not Rated |
| Newby Dam Hardin County | 27 | 1965 | Low | Not Rated |
| New London Country Club Dam Henry County | 26 | 1910 | Low | Satisfactory |
| Newquist Grade Stabilization Structure Wapello County | 27 | 2011 | Low | Not Rated |
| Newton Dam Adair County | 22 | 1974 | Low | Not Rated |
| Newton Dam Adair County | 20 | 1959 | Low | Not Rated |
| Niacc Dam Cerro Gordo County | 24 | 1973 | Low | Not Rated |
| Nice/Crumly Dam Muscatine County | 35 | 1969 | Low | Not Rated |
| Nichols Dam Warren County | 28 | 1992 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.