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 151–175 of 259
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Indian Creek Watershed Site 2 Pottawattamie County | 65 | 1975 | High | Satisfactory |
| Indian Creek-Van Buren Watershed Site 27 Van Buren County | 36 | 1990 | Significant | Satisfactory |
| Horse Lake Dam Plymouth County | 67 | 1963 | Significant | Satisfactory |
| Hooper Dam Warren County | 37 | 1996 | Significant | Satisfactory |
| Holiday Lake Dam Poweshiek County | 50 | 1962 | Significant | Satisfactory |
| Hickory Hills Recreation Dam Tama County | 29 | 1970 | Low | Satisfactory |
| Hickory Grove Lake Dam Story County | 56 | 1966 | Significant | Satisfactory |
| Hickory Glen Park Dam Polk County | 35 | 2019 | Significant | Satisfactory |
| Heritage Woods Dam Dallas County | 35 | 2008 | High | Satisfactory |
| Heritage Point Lake Dam Wayne County | 47 | 1971 | Significant | Satisfactory |
| Hendrickson Marsh Dam Marshall County | 18 | 1967 | Significant | Satisfactory |
| Hawthorne Lake Dam Mahaska County | 45 | 1979 | Significant | Satisfactory |
| Hannen Lake Dam Benton County | 35 | 1959 | Significant | Satisfactory |
| Hamburg Watershed Site M-1 Fremont County | 55 | 1961 | High | Satisfactory |
| Hallbrook Pond Dam Dallas County | 17 | 2009 | Significant | Satisfactory |
| Greenfield Reservoir Dam Adair County | 42 | 1979 | High | Satisfactory |
| Greene Mill Dam Butler County | 11 | 1925 | Low | Satisfactory |
| Green Castle Dam Marshall County | 30 | 1954 | Significant | Satisfactory |
| Greenbriar Dam Dallas County | 52 | 1972 | Significant | Satisfactory |
| Grade Lake Dam Clarke County | 44 | 1900 | High | Satisfactory |
| Glen Oaks Country Club Dam Polk County | 36 | 1950 | High | Satisfactory |
| Glen Ellen Subwatershed Site 3-1 Woodbury County | 29 | 1963 | High | Satisfactory |
| Gibson South - Dredge Spoil Disposal Guthrie County | 95 | 1999 | Significant | Satisfactory |
| Geode Lake Dam Des Moines County | 59 | 1949 | Significant | Satisfactory |
| Gehring Dam Linn County | 28 | 2007 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.