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 401–425 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Blockton Watershed Site W-7 Taylor County | 24 | 1966 | Low | Not Rated |
| Bloom Dam Harrison County | 33 | 2006 | Low | Not Rated |
| Bloomer Dam Washington County | 25 | 1972 | Low | Not Rated |
| Bloomquist Dam Jefferson County | 27 | 2002 | Low | Not Rated |
| Blue Grass Lake Dam Scott County | 28 | 1974 | Significant | Satisfactory |
| Bluff Creek Reclamation Dam Monroe County | 42 | 2004 | Low | Not Rated |
| Blume/Haley Dam Plymouth County | 47 | 1966 | Low | Not Rated |
| Bobwhite Lake Dam Wayne County | 27 | 1900 | Significant | Fair |
| Bodkins Dam Davis County | 22 | 1997 | Low | Not Rated |
| Boeck Dam Crawford County | 34 | 1974 | Low | Not Rated |
| Bohlen Dam Des Moines County | 52 | 1985 | Low | Not Rated |
| Boone Milldam Boone County | 7 | 1932 | Low | Not Rated |
| Boothe Dam Warren County | 30 | 1975 | Low | Not Rated |
| Boswell Dam Lucas County | 28 | 2000 | Low | Not Rated |
| Bott Dam Iowa County | 29 | 2000 | Low | Not Rated |
| Bourjaily Dam Johnson County | 22 | 1971 | Low | Not Rated |
| Boustead/Coenen/Pryor Dam Harrison County | 62 | 1965 | Low | Not Rated |
| Bowden Dam Webster County | 37 | 1997 | Low | Not Rated |
| Bower Off-Road Dam Union County | 32 | 1990 | Low | Not Rated |
| Boy Scout Bay Dam Davis County | 13 | 1993 | Low | Not Rated |
| Bradfield Dam Jefferson County | 17 | 1985 | Low | Not Rated |
| Bradford Dam Davis County | 33 | 1977 | Low | Not Rated |
| Bradford Dam Guthrie County | 28 | 1975 | Low | Not Rated |
| Bradford/Miller Dam Appanoose County | 29 | 1969 | Low | Not Rated |
| Brad Wiley Dam Madison County | 32 | 2014 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.