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 91
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Pony Creek Watershed Site 21 Mills County | 75 | 1971 | High | Satisfactory |
| Pleasant Creek Lake Dam Linn County | 73 | 1977 | High | Satisfactory |
| Pikes Peak Flood Control Dam Clayton County | 49 | 1938 | High | Satisfactory |
| Parkview Lake Dam Polk County | 21 | 1978 | High | Satisfactory |
| Oaknoll Dam Johnson County | 25 | 1994 | High | Fair |
| North Branch Ralston Creek Dam Johnson County | 37 | 1983 | High | Satisfactory |
| Monument Road Dam Pottawattamie County | 32 | 2011 | High | Satisfactory |
| Mill Picayune Watershed Site B-3 Harrison County | 38 | 1962 | High | Satisfactory |
| Middle Pond Dam Iowa County | 27 | 1955 | High | Poor |
| Meyer Dam Crawford County | 45 | 1965 | High | Fair |
| Maffitt Reservoir Dam Dallas County | 79 | 1944 | High | Satisfactory |
| Lost Grove Lake Scott County | 75 | 2012 | High | Satisfactory |
| Little River Watershed Site M-1 Decatur County | 61 | 1984 | High | Satisfactory |
| Littlefield Lake Dam Audubon County | 45 | 1977 | High | Satisfactory |
| Leisure Lake Dam Jackson County | 58 | 1958 | High | Fair |
| Lake Sugema Dam Van Buren County | 50 | 1992 | High | Satisfactory |
| Lake Ponderosa Dam Poweshiek County | 50 | 1969 | High | Satisfactory |
| Lake of The Hills Dam Scott County | 48 | 1972 | High | Satisfactory |
| Lake Cimarron Poweshiek County | 27 | 2012 | High | Satisfactory |
| Jefferson Park Watershed Site 5 Wapello County | 43 | 1985 | High | Satisfactory |
| Jefferson Park Watershed Site 4 Wapello County | 36 | 1978 | High | Satisfactory |
| Jefferson Park Watershed Site 3 Wapello County | 42 | 1976 | High | Satisfactory |
| Jefferson Park Watershed Site 10 Wapello County | 30 | 1983 | High | Satisfactory |
| Jefferson Park Watershed Site 1 Wapello County | 36 | 1976 | High | Satisfactory |
| Indian Creek Watershed Site 2 Pottawattamie County | 65 | 1975 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.