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 676–700 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Troublesome Creek Watershed Site 85-1 Audubon County | 25 | 2003 | Low | Not Rated |
| Troublesome Creek Watershed Site 78-4 Cass County | 35 | 1999 | Low | Not Rated |
| Troublesome Creek Watershed Site 78-3 Cass County | 25 | 1999 | Low | Not Rated |
| Troublesome Creek Watershed Site 29-1 Cass County | 25 | 2003 | Low | Not Rated |
| Trotter Dam Jasper County | 31 | 1971 | Low | Not Rated |
| Triplett Dam Polk County | 30 | 1969 | Low | Not Rated |
| Triple B Dam 2 Jasper County | 32 | 1997 | Low | Not Rated |
| Triple B Dam 1 Jasper County | 30 | 1997 | Low | Not Rated |
| Trinkle Reclamation Dam C Marion County | 26 | 1999 | Low | Not Rated |
| Trimble Dam Ringgold County | 19 | 1984 | Low | Not Rated |
| Treynor Farm Supply Dam Pottawattamie County | 31 | 2004 | Low | Not Rated |
| Travis Dam Union County | 21 | 1967 | Low | Not Rated |
| Trausch Dam Madison County | 31 | 2002 | Low | Not Rated |
| Trauger Dam Humboldt County | 24 | 1990 | Low | Not Rated |
| Trachsel Dam Van Buren County | 34 | 2003 | Low | Not Rated |
| Tordoff Dam Woodbury County | 28 | 1995 | Low | Not Rated |
| Tonderum Dam Emmet County | 21 | 1970 | Low | Not Rated |
| Tomson Dam Chickasaw County | 19 | 1997 | Low | Not Rated |
| Tom King Subwatershed Site 6290 Monona County | 26 | 1956 | Low | Not Rated |
| Tolton Dam Cass County | 30 | 2020 | Low | Not Rated |
| Todd Dam Woodbury County | 26 | 1960 | Low | Not Rated |
| Tjaden Dam Hardin County | 30 | 1985 | Low | Not Rated |
| Tim Temeyer Dam Pottawattamie County | 33 | 2020 | Low | Not Rated |
| Tim Seim Dam Tama County | 25 | 2017 | Low | Not Rated |
| Timm Dam Crawford County | 39 | 1975 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.