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 1726–1750 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Jennett Dam Story County | 32 | 1970 | Low | Not Rated |
| Jensen Dam Adair County | 24 | 1963 | Low | Not Rated |
| Jensen Wetland Fremont County | 8 | 2002 | Low | Not Rated |
| Jester Park Estates Dam Polk County | 11 | 2005 | Significant | Satisfactory |
| Jett Subwatershed Site 16-1 Woodbury County | 36 | 1966 | Low | Not Rated |
| Jett Subwatershed Site 2-1 Woodbury County | 33 | 2002 | Low | Not Rated |
| Jett Subwatershed Site M-1 Woodbury County | 32 | 1966 | Low | Not Rated |
| Jett Subwatershed Site M-2 Woodbury County | 34 | 1966 | Low | Not Rated |
| Jett Subwatershed Site M-4 Woodbury County | 41 | 1966 | Low | Not Rated |
| Jett Subwatershed Site M-5 Woodbury County | 43 | 1966 | Low | Not Rated |
| Jett Subwatershed Site M-6 Woodbury County | 32 | 2003 | Low | Not Rated |
| Jewell Dam Winneshiek County | 31 | 2022 | Low | Not Rated |
| Jim Utt Dam Davis County | 19 | 2016 | Low | Not Rated |
| Jim Walter Dam Adair County | 26 | 2018 | Low | Not Rated |
| Joe Sinclair Dam Monroe County | 35 | 2018 | Low | Not Rated |
| John Deere Davenport Works Dam Scott County | 24 | 1975 | Significant | Satisfactory |
| John Deere Tcao Dam Black Hawk County | 15 | 1980 | Significant | Satisfactory |
| John Hackbarth Hardin County | 31 | 2002 | Low | Not Rated |
| Johnson Dam Lucas County | 31 | 1972 | Low | Not Rated |
| Johnson Dam Davis County | 25 | 1990 | Low | Not Rated |
| Johnson Dam Ringgold County | 24 | 2007 | Low | Not Rated |
| Johnson Dam Taylor County | 31 | 1961 | Low | Not Rated |
| Johnson Dam Mills County | 30 | 2006 | Low | Not Rated |
| Johnson Dam Monona County | 27 | 2008 | Low | Not Rated |
| Johnson Dam Davis County | 32 | 1972 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.