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 701–725 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Tim Lau Site 2 Clarke County | 35 | 2016 | Low | Not Rated |
| Tim Lau Site 1 Clarke County | 32 | 2016 | Low | Not Rated |
| Timberman Dam Pottawattamie County | 30 | 1963 | Low | Not Rated |
| Timber Lakes Estate Dam Scott County | 57 | 2000 | Significant | Not Rated |
| Tierney Dam Keokuk County | 14 | 2002 | Low | Not Rated |
| Tiefenthaler Dam Crawford County | 29 | 1976 | Low | Not Rated |
| Tiefenthaler Dam Crawford County | 31 | 1966 | Low | Not Rated |
| Tibbals Dam Monroe County | 29 | 2005 | Low | Not Rated |
| Thye Dam Adair County | 43 | 1968 | Low | Not Rated |
| Thunder Bay Lake Dam Polk County | 19 | 2010 | Significant | Satisfactory |
| Threlkeld Dam Washington County | 32 | 2010 | Low | Not Rated |
| Three Mile Reservoir Dam Union County | 63 | 1995 | Significant | Satisfactory |
| Three Mile Lake Sediment Dam Union County | 26 | 1999 | Low | Not Rated |
| Three Mile Creek Watershed Site U-7 Union County | 27 | 1980 | Low | Not Rated |
| Three Mile Creek Watershed Site U-5-B Union County | 28 | 1980 | Low | Not Rated |
| Three Mile Creek Watershed Site U-5-A Union County | 24 | 1980 | Low | Not Rated |
| Three Mile Creek Watershed Site U-4 Union County | 28 | 1980 | Low | Not Rated |
| Three Mile Creek Watershed Site U-3 Union County | 23 | 1980 | Low | Not Rated |
| Three Mile Creek Watershed Site U-2 Union County | 26 | 1980 | Low | Not Rated |
| Three Mile Creek Watershed Site 9 Union County | 31 | 1970 | Low | Not Rated |
| Three Mile Creek Watershed Site 66 Adair County | 23 | 1969 | Low | Not Rated |
| Three Mile Creek Watershed Site 65 Adair County | 30 | 1968 | Low | Not Rated |
| Three Mile Creek Watershed Site 63 Adair County | 33 | 1968 | Low | Not Rated |
| Three Mile Creek Watershed Site 58 Union County | 32 | 1968 | Low | Not Rated |
| Three Mile Creek Watershed Site 52-1 Union County | 35 | 1976 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.