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 1–24 of 24
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Zaugg Dam Pocahontas County | 42 | 1998 | Low | Poor |
| Upper Beaver Subwatershed Site M-1 Monona County | 60 | 1967 | Low | Poor |
| Twin Valley Lakes - East Dam Johnson County | 50 | 1965 | Significant | Poor |
| Turkey Cr Watershed Site 50d Cass County | 31 | 1974 | Significant | Poor |
| Smokey Hollow Subwatershed Site 4 Woodbury County | 64 | 1985 | High | Poor |
| Schoenewe Dam Des Moines County | 41 | 1978 | High | Poor |
| Olson Dam Story County | 24 | 1969 | Low | Poor |
| Newton Koa Campground Dam Jasper County | 20 | — | Significant | Poor |
| Middle Pond Dam Iowa County | 27 | 1955 | High | Poor |
| Mathes Des Moines County | 64 | 1941 | Low | Poor |
| Marion County Roadgrade Dam 17-76-18 Marion County | 40 | 1965 | Significant | Poor |
| Lake Ohana Dam #1 Mills County | 46 | 2007 | Significant | Poor |
| Lake Hendricks Dam Howard County | 30 | 1960 | Significant | Poor |
| Kenkel Dam Crawford County | 29 | 1961 | Low | Poor |
| Indian Cr-Van Buren Watershed Site 15 Van Buren County | 37 | 1989 | Low | Poor |
| Humeston Reservoir Dam Wayne County | 31 | 1916 | Significant | Poor |
| Horseshoe Cove Dam Guthrie County | 32 | 1975 | Significant | Poor |
| Held Watershed Site E-4 Plymouth County | 37 | 1978 | High | Poor |
| Held Watershed Site E-3 Plymouth County | 43 | 1978 | High | Poor |
| Grell Pond Dam Ida County | 26 | 1958 | Significant | Poor |
| Dixon Dam Davis County | 20 | 1959 | Low | Poor |
| Bacon Creek Watershed Site J-5 Woodbury County | 23 | 1984 | Significant | Poor |
| Bacon Creek Watershed Site A-2-3 Woodbury County | 47 | 1978 | Significant | Poor |
| Bacon Creek Watershed Site A-2-1 Woodbury County | 55 | 1978 | Significant | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.