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 1226–1250 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Rodgers Park Lake Dam Benton County | 30 | 1977 | Significant | Fair |
| Rodgers Dam Davis County | 30 | 1970 | Low | Not Rated |
| Rodgers Dam Jasper County | 34 | 1967 | Low | Not Rated |
| Rodgers Dam Marion County | 28 | 1981 | Low | Not Rated |
| Rodenburg/Porter Dam Pottawattamie County | 39 | 1959 | Low | Not Rated |
| Rod and Reel Lake Dam Decatur County | 35 | 1970 | Low | Not Rated |
| Rocky Branch Creek Watershed Site H-7 Jefferson County | 21 | 1958 | Low | Not Rated |
| Rocky Branch Creek Watershed Site H-5 Jefferson County | 26 | 1958 | Low | Not Rated |
| Rocky Branch Creek Watershed Site D-2 Jefferson County | 35 | 1964 | Low | Not Rated |
| Rocky Branch Creek Watershed Site C-2 Jefferson County | 29 | 1969 | Low | Not Rated |
| Rocky Branch Creek Watershed Site A-5 Jefferson County | 26 | 1960 | Low | Not Rated |
| Rocky Branch Creek Watershed Site 4 Jefferson County | 25 | 1962 | Low | Not Rated |
| Rocky Branch Creek, Site Mike Taylor Dam Madison County | 34 | 2016 | Low | Not Rated |
| Rock Valley Lake Dam Wayne County | 39 | 2008 | Significant | Fair |
| Rock Rapids Milldam Lyon County | 7 | 1931 | Low | Not Rated |
| Rock Creek Dam Jasper County | 33 | — | Significant | Fair |
| Robson Dam Greene County | 25 | 1960 | Low | Not Rated |
| Robison Dam Taylor County | 32 | 2007 | Low | Not Rated |
| Robinson Dam Van Buren County | 34 | 2001 | Low | Not Rated |
| Robinson Dam Montgomery County | 29 | 2021 | Low | Not Rated |
| Robinson Dam Mahaska County | 27 | 1997 | Low | Not Rated |
| Robinette Dam Montgomery County | 32 | 2013 | Low | Not Rated |
| Robeson Subwatershed Site 4400 Cherokee County | 40 | 1955 | Low | Not Rated |
| Robeson Subwatershed Site 3055 Cherokee County | 31 | 1955 | Low | Not Rated |
| Robeson Subwatershed Gully 3 Sta92+50 Cherokee County | 45 | 1955 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.