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 2026–2050 of 3,759
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Meggison Dam Dallas County | 30 | 1977 | Low | Not Rated |
| Meinking Marsh Dam Dickinson County | 14 | 1992 | Low | Not Rated |
| Meisner Dam Jasper County | 30 | 1968 | Low | Not Rated |
| Mellot Dam Montgomery County | 27 | 1961 | Low | Not Rated |
| Melton Dam Fremont County | 35 | 1962 | Low | Not Rated |
| Merrill Dorland Dam Clarke County | 31 | 2014 | Low | Not Rated |
| Merritt/Roden Dam Carroll County | 36 | 1974 | Low | Not Rated |
| Messerschmitt Dam Wapello County | 27 | 1997 | Low | Not Rated |
| Metro West Dam (Sw) Polk County | 20 | 1996 | Low | Not Rated |
| Meyer Dam East Crawford County | 27 | 2010 | Low | Not Rated |
| Miami Lake Sediment Control Dam Site 1 Monroe County | 35 | 1980 | Low | Not Rated |
| Miami Lake Sediment Control Dam Site 2 Monroe County | 33 | 1980 | Low | Not Rated |
| Miami Lake Sediment Control Dam Site 3 Monroe County | 32 | 1980 | Low | Not Rated |
| Middleton Dam Warren County | 28 | 1997 | Low | Not Rated |
| Midwest Oilseed Dam #2 Dallas County | 52 | 2002 | Low | Not Rated |
| Midwest Oilseeds Dam Dallas County | 33 | 2002 | Low | Not Rated |
| Midwest Oilseeds Dam Dallas County | 51 | 2000 | Low | Not Rated |
| Mike Mikkelson Subwatershed 11-3227 Monona County | 28 | 1960 | Low | Not Rated |
| Mike Mikkelson Subwatershed 3-1630 Monona County | 39 | 1960 | Low | Not Rated |
| Mike Mikkelson Subwatershed 5-10316 Monona County | 39 | 1960 | Low | Not Rated |
| Mike Mikkelson Subwatershed 5-13484 Monona County | 35 | 1960 | Low | Not Rated |
| Mike Mikkelson Subwatershed 5-18280 Monona County | 27 | 1960 | Low | Not Rated |
| Mike Mikkelson Subwatershed 5-5020 Monona County | 50 | 1970 | Low | Not Rated |
| Mike Mikkelson Subwatershed 9-2555 Monona County | 31 | 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.