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 2001–2025 of 3,759
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mc Guire Dam Union County | 29 | 2003 | Low | Not Rated |
| Mchugh Dam Monona County | 31 | 2011 | Low | Not Rated |
| Mc Intosh Dam Harrison County | 42 | 1977 | Low | Not Rated |
| Mcintyre Dam Decatur County | 30 | 2013 | Low | Not Rated |
| Mckean Dam Adams County | 29 | 2013 | Low | Not Rated |
| Mc Kenzie/Child Dam Pottawattamie County | 31 | 1959 | Low | Not Rated |
| Mc Knight Dam Clarke County | 18 | 1965 | Low | Not Rated |
| Mc Larty-Edwards Subwatershed Site M-5 Woodbury County | 23 | 1966 | Low | Not Rated |
| Mc Larty-Edwards Subwtrshd #9 19+77 Woodbury County | 33 | 1966 | Low | Not Rated |
| Mc Larty-Edwards Subwtrshd #M 100+30 Woodbury County | 27 | 1966 | Low | Not Rated |
| Mc Larty-Edwards Subwtrshd Sta 20+00 #1 Woodbury County | 33 | 1966 | Low | Not Rated |
| Mc Larty-Edwards Subwtrshd Sta 35+50 #1 Woodbury County | 30 | 1966 | Low | Not Rated |
| Mc Larty-Edwards Subwtrshd Sta 54+65 #1 Woodbury County | 25 | 1966 | Low | Not Rated |
| Mc Larty-Edwards Subwtrshd Sta 65+93 #M Woodbury County | 33 | 1966 | Low | Not Rated |
| Mc Larty-Edwards Subwtrshd Sta 73+25 #2 Woodbury County | 25 | 1966 | Low | Not Rated |
| Mc Manigal Dam Mills County | 32 | 1945 | Low | Not Rated |
| Mc Masters Subwatershed 2703 Monona County | 32 | 1955 | Low | Not Rated |
| Mc Masters Subwatershed 3075 Monona County | 25 | 1955 | Low | Not Rated |
| Mc Masters Subwatershed 3907 Monona County | 42 | 1955 | Low | Not Rated |
| Mc Millan Dam Decatur County | 28 | 1987 | Low | Not Rated |
| Mc Mullin Dam Wapello County | 22 | 2002 | Low | Not Rated |
| Mc Murray Wetland Dam Wayne County | 16 | 1998 | Low | Not Rated |
| Mc Whirter Dam Jasper County | 32 | 1960 | Low | Not Rated |
| Mead Dam Warren County | 28 | 1981 | Low | Not Rated |
| Meadow Lake Sediment Detention Dam Adair County | 23 | 2010 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.