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 2151–2175 of 3,759
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Jones Dam Taylor County | 25 | 2002 | Low | Not Rated |
| Jones Dam Decatur County | 27 | 1992 | Low | Not Rated |
| Jones Cove Dam Guthrie County | 34 | 1994 | Low | Not Rated |
| Jones Brothers Dam Jefferson County | 32 | 1977 | Low | Not Rated |
| Jones Brothers Dam Jefferson County | 24 | 1965 | Low | Not Rated |
| Jon Bix Dam Page County | 34 | 2023 | Low | Not Rated |
| Jonbar Ranch Dam Dallas County | 25 | 1957 | Low | Not Rated |
| Jonbar Ranch Dam Dallas County | 33 | 1966 | Low | Not Rated |
| Johnston Dam Van Buren County | 29 | 2005 | Low | Not Rated |
| Johnston Dam Davis County | 25 | 1972 | Low | Not Rated |
| Johnston Dam Dallas County | 43 | 1971 | Low | Not Rated |
| Johnston Dam Van Buren County | 33 | 1962 | Low | Not Rated |
| Johnston Dam Marion County | 36 | 1973 | Low | Not Rated |
| Johnson (Oscar) Dam Harrison County | 49 | 2011 | Low | Not Rated |
| Johnson Dam (Washington Co) Louisa County | 25 | 2005 | Low | Not Rated |
| Johnson Dam Site 2 Jefferson County | 26 | 1993 | Low | Not Rated |
| Johnson Dam Site 1 Jefferson County | 27 | 1993 | Low | Not Rated |
| Johnson Dam Mills County | 30 | 2006 | Low | Not Rated |
| Johnson Dam Jefferson County | 20 | 1991 | Low | Not Rated |
| Johnson Dam Davis County | 26 | 1996 | Low | Not Rated |
| Johnson Dam Davis County | 25 | 1990 | Low | Not Rated |
| Johnson Dam Lucas County | 31 | 1972 | Low | Not Rated |
| Johnson Dam Taylor County | 31 | 1961 | Low | Not Rated |
| Johnson Dam Ringgold County | 24 | 2007 | Low | Not Rated |
| Johnson Dam Davis County | 27 | 1958 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.