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 26–50 of 259
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Volga Lake Dam Fayette County | 45 | 1980 | Significant | Satisfactory |
| Virden Creek Dam Black Hawk County | 39 | 1979 | High | Satisfactory |
| Upper Pine Lake Dam Hardin County | 42 | 1934 | Significant | Satisfactory |
| Twin Ponies Watershed Site 17a Pottawattamie County | 54 | 1998 | Low | Satisfactory |
| Twenty-Sixth Street Stormwater Detention Basin Polk County | 43 | 2007 | High | Satisfactory |
| Twelve Mile Creek Watershed Site M-1 Union County | 66 | 1983 | High | Satisfactory |
| Twelve Mile Creek Watershed Site D-62-1 Union County | 35 | 1985 | Significant | Satisfactory |
| Turkey Cr Watershed Site 55d Cass County | 42 | 1994 | Significant | Satisfactory |
| Turkey Cr Watershed Site 24-2 Cass County | 34 | 1984 | Significant | Satisfactory |
| Turkey Cr Watershed Site 24-1 Cass County | 31 | 1990 | Significant | Satisfactory |
| Thunder Bay Lake Dam Polk County | 19 | 2010 | Significant | Satisfactory |
| Three Mile Reservoir Dam Union County | 63 | 1995 | Significant | Satisfactory |
| Thomas Mitchell Park Dam Polk County | 27 | 1971 | Significant | Satisfactory |
| Thirty-Fifth Street Dam Polk County | 23 | 1992 | Significant | Satisfactory |
| Sw Branch Dry Run Creek Stormwater Detention Dam Black Hawk County | 17 | 2003 | High | Satisfactory |
| Sun Valley Lake Dam Ringgold County | 67 | 1971 | Significant | Satisfactory |
| Summit Lake Dam Union County | 26 | 1935 | Low | Satisfactory |
| Stump Lake Des Moines County | 29 | 1941 | Low | Satisfactory |
| Storm Lake - Northeast Dredge Spoil Disposal Dam Buena Vista County | 49 | 2005 | High | Satisfactory |
| Springbrook Lake Dam Guthrie County | 40 | 1934 | Significant | Satisfactory |
| Southridge Road Detention Basin Marshall County | 18 | 1996 | Significant | Satisfactory |
| South Ridge Estates - East Dam Sioux County | 17 | 2007 | High | Satisfactory |
| Southpoint Wetland Mitigation Dam Polk County | 15 | 2004 | Low | Satisfactory |
| Southfork Dam Dallas County | 38 | 1988 | High | Satisfactory |
| Smokey Hollow Subwatershed Site 3 Woodbury County | 58 | 1986 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.