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 1076–1100 of 3,759
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Gant Creek Watershed Site B-1 Plymouth County | 38 | 1967 | Low | Not Rated |
| Gant Creek Watershed Site C-2 Plymouth County | 28 | 1974 | Low | Not Rated |
| Gant Creek Watershed Site C-3 Plymouth County | 40 | 1974 | Low | Not Rated |
| Gant Creek Watershed Site C-4 Plymouth County | 37 | 1974 | Low | Not Rated |
| Gant Creek Watershed Site C-6 Plymouth County | 52 | 1974 | Low | Not Rated |
| Gant Creek Watershed Site D-1 Plymouth County | 26 | 1967 | Low | Not Rated |
| Gant Creek Watershed Site D-3 Plymouth County | 36 | 1967 | Low | Not Rated |
| Gant Creek Watershed Site D-5 Plymouth County | 47 | 1967 | Low | Not Rated |
| Gant Creek Watershed Site D-6 Plymouth County | 30 | 1967 | Low | Not Rated |
| Ganzhorn Dam Harrison County | 30 | 1970 | Low | Not Rated |
| Gardner Dam Washington County | 32 | 2003 | Low | Not Rated |
| Gardner Dam Monroe County | 29 | 1992 | Low | Not Rated |
| Gardner Dam Wayne County | 33 | 2001 | Low | Not Rated |
| Garner Dam Clarke County | 33 | 1986 | Low | Not Rated |
| Garner Dam Linn County | 26 | 2000 | Low | Not Rated |
| Garnett Dam Clarke County | 29 | 1985 | Low | Not Rated |
| Garns Dam Dallas County | 34 | 1994 | Low | Not Rated |
| Garrels Dam Henry County | 18 | 2004 | Low | Not Rated |
| Garretson Dam Henry County | 28 | 1988 | Low | Not Rated |
| Garrett Dam Crawford County | 31 | 1967 | Low | Not Rated |
| Garst/Betts Dam Guthrie County | 27 | 1966 | Low | Not Rated |
| Garst Dam Guthrie County | 27 | 1969 | Low | Not Rated |
| Garst Dam Guthrie County | 32 | 1967 | Low | Not Rated |
| Garst Dam Guthrie County | 25 | 1977 | Low | Not Rated |
| Garst Dam Guthrie County | 26 | 1981 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.