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 226–250 of 274
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Smith Dam Woodbury County | 34 | 1965 | Significant | Not Rated |
| Southeast Dam (Dubuque) Dubuque County | 24 | 2000 | Significant | Fair |
| South Ridge Estates - South Dam Sioux County | 11 | 2007 | Significant | Not Rated |
| South Ridge Estates - West Dam Sioux County | 8 | 2007 | Significant | Not Rated |
| Southridge Road Detention Basin Marshall County | 18 | 1996 | Significant | Satisfactory |
| Springbrook Lake Dam Guthrie County | 40 | 1934 | Significant | Satisfactory |
| Storm Lake Dredge Spoil Dam - Central Structure Buena Vista County | 24 | 2002 | Significant | Not Rated |
| Sun Valley Lake Dam Ringgold County | 67 | 1971 | Significant | Satisfactory |
| Sun Valley Lake Sediment Basin Ringgold County | 40 | 2019 | Significant | Not Rated |
| Thirty-Fifth Street Dam Polk County | 23 | 1992 | Significant | Satisfactory |
| Thomas Mitchell Park Dam Polk County | 27 | 1971 | Significant | Satisfactory |
| Three Mile Reservoir Dam Union County | 63 | 1995 | Significant | Satisfactory |
| Thunder Bay Lake Dam Polk County | 19 | 2010 | Significant | Satisfactory |
| Timber Lakes Estate Dam Scott County | 57 | 2000 | Significant | Not Rated |
| Troublesome Cr Watershed Site 84-1 Audubon County | 32 | 1976 | Significant | Not Rated |
| Turkey Cr Watershed Site 24-1 Cass County | 31 | 1990 | Significant | Satisfactory |
| Turkey Cr Watershed Site 24-2 Cass County | 34 | 1984 | Significant | Satisfactory |
| Turkey Cr Watershed Site 50d Cass County | 31 | 1974 | Significant | Poor |
| Turkey Cr Watershed Site 55d Cass County | 42 | 1994 | Significant | Satisfactory |
| Turkey Cr Watershed Site 59d-1 Cass County | 32 | 1990 | Significant | Fair |
| Turkey Cr Watershed Site 59d-2 Cass County | 36 | 1980 | Significant | Fair |
| Twelve Mile Creek Watershed Site D-62-1 Union County | 35 | 1985 | Significant | Satisfactory |
| Twin Valley Lakes - East Dam Johnson County | 50 | 1965 | Significant | Poor |
| Union Grove Lake Dam Tama County | 29 | 1920 | Significant | Fair |
| Upper Centerville Reservoir Dam Appanoose County | 48 | 1912 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.