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 726–750 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Three Mile Creek Watershed Site 50-2 Union County | 31 | 1980 | Low | Not Rated |
| Three Mile Creek Watershed Site 50-1 Union County | 33 | 1976 | Low | Not Rated |
| Three Mile Creek Watershed Site 49 Union County | 37 | 1976 | Low | Not Rated |
| Three Mile Creek Watershed Site 45-2 Union County | 31 | 1970 | Low | Not Rated |
| Three Mile Creek Watershed Site 45-1 Union County | 31 | 1970 | Low | Not Rated |
| Three Mile Creek Watershed Site 43-1 Union County | 32 | 1976 | Low | Not Rated |
| Three Mile Creek Watershed Site 42 Union County | 35 | 1970 | Low | Not Rated |
| Three Mile Creek Watershed Site 36 Union County | 35 | 1976 | Low | Not Rated |
| Three Mile Creek Watershed Site 33 Union County | 36 | 1976 | Low | Not Rated |
| Three Mile Creek Watershed Site 3 Union County | 33 | 1970 | Low | Not Rated |
| Three Mile Creek Watershed Site 29 Union County | 33 | 1970 | Low | Not Rated |
| Three Mile Creek Watershed Site 14-P Union County | 23 | 1976 | Low | Not Rated |
| Three Mile Creek Watershed Site 14-M Union County | 25 | 1976 | Low | Not Rated |
| Three Mile Creek Watershed Site 14-G-1 Union County | 27 | 1976 | Low | Not Rated |
| Three Mile Creek Watershed Site 14-G Union County | 31 | 1970 | Low | Not Rated |
| Three D Dam Story County | 34 | 1971 | Low | Not Rated |
| Thorn Tree Dam Warren County | 42 | 1997 | Low | Not Rated |
| Thorland Dam Winnebago County | 20 | 1968 | Low | Not Rated |
| Thomson Dam Crawford County | 27 | 1975 | Low | Not Rated |
| Thomsen Dam Woodbury County | 38 | 1959 | Low | Not Rated |
| Thompson Dam Decatur County | 26 | 1990 | Low | Not Rated |
| Thompson Dam Pottawattamie County | 40 | 1955 | Low | Not Rated |
| Thompson Dam Lee County | 38 | 1979 | Low | Not Rated |
| Thompson Dam Cass County | 25 | 1975 | Low | Not Rated |
| Thompson Dam Decatur County | 29 | 1965 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.