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 1826–1850 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mill Picayune Watershed Site B-3 Harrison County | 38 | 1962 | High | Satisfactory |
| Mill Picayune Watershed Site A-2 Harrison County | 31 | 1966 | Low | Not Rated |
| Mill Picayune Watershed Site 13-1 Shelby County | 47 | 1975 | Low | Not Rated |
| Milligan Dam Union County | 25 | 1973 | Low | Not Rated |
| Miller Subwatershed Site 4-3375 Woodbury County | 32 | 1959 | Low | Not Rated |
| Miller Subwatershed 3-A-1500 Woodbury County | 34 | 1960 | Low | Not Rated |
| Miller Subwatershed 3-2975 Woodbury County | 33 | 1960 | Low | Not Rated |
| Miller & Stender Dam Crawford County | 35 | 1969 | Low | Not Rated |
| Miller-Main Dam Union County | 27 | 1990 | Low | Not Rated |
| Miller Dam Page County | 29 | 1966 | Low | Not Rated |
| Miller Dam Davis County | 28 | 1996 | Low | Not Rated |
| Miller Dam Crawford County | 30 | 1944 | Low | Not Rated |
| Miller Dam Dallas County | 28 | 1992 | Low | Not Rated |
| Miller Dam Fremont County | 45 | 1961 | Low | Not Rated |
| Miller Dam Appanoose County | 25 | 1977 | Low | Not Rated |
| Miller Dam Jefferson County | 20 | 1963 | Low | Not Rated |
| Miller Dam Iowa County | 39 | 1999 | Low | Not Rated |
| Miller Dam Johnson County | 29 | 1971 | Low | Not Rated |
| Millenkamp Dam Delaware County | 27 | 1999 | Low | Not Rated |
| Mill Creek Lake Dam O'Brien County | 29 | 1934 | Low | Satisfactory |
| Millard Dam Davis County | 33 | 2002 | Low | Not Rated |
| Miksch Dam Washington County | 27 | 2023 | Low | Not Rated |
| Mike Mikkelson Subwatershed M-5905 Monona County | 24 | 1960 | Low | Not Rated |
| Mike Mikkelson Subwatershed M-2395 Monona County | 27 | 1960 | Low | Not Rated |
| Mike Mikkelson Subwatershed M-10210 Monona County | 25 | 1960 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.