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 2926–2950 of 3,759
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| South Magnolia Watershed Site 4 Harrison County | 34 | 1958 | Low | Not Rated |
| South Magnolia Watershed Site 5 Harrison County | 37 | 1958 | Low | Not Rated |
| South Magnolia Watershed Site Z Harrison County | 44 | 1958 | Low | Not Rated |
| Southpoint Wetland Mitigation Dam Polk County | 15 | 2004 | Low | Satisfactory |
| Southwest Iowa Egg Cooperative Dam Cass County | 38 | 1999 | Low | Not Rated |
| Sparks Dam Woodbury County | 23 | 1964 | Low | Not Rated |
| Speck Dam Mills County | 34 | 2004 | Low | Not Rated |
| Spence Dam Warren County | 32 | 2003 | Low | Not Rated |
| Spencer Dam Harrison County | 47 | 2007 | Low | Not Rated |
| Spencer Dam Pottawattamie County | 33 | 1966 | Low | Not Rated |
| Spillers Dam Dallas County | 28 | 1962 | Low | Not Rated |
| Split Rock Dam Chickasaw County | 25 | 1964 | Low | Not Rated |
| Sponsler Dam Clarke County | 22 | 2008 | Low | Not Rated |
| Sponsler Dam Wayne County | 20 | 1961 | Low | Not Rated |
| Springer Dam Greene County | 33 | 1965 | Low | Not Rated |
| Spring Lake Dam Cherokee County | 8 | — | Low | Not Rated |
| Spring Valley Project No. 2 Monona County | 36 | 1974 | Low | Not Rated |
| Srite Dam Page County | 37 | 2023 | Low | Not Rated |
| Stacey Dam Wapello County | 26 | 2000 | Low | Not Rated |
| Staceyville Dam Mitchell County | 8 | 1933 | Low | Not Rated |
| Stajcar Dam Appanoose County | 27 | 2005 | Low | Not Rated |
| Staley & Rae Dam Crawford County | 35 | 1968 | Low | Not Rated |
| Stalkfleet Dam Muscatine County | 19 | 2008 | Low | Not Rated |
| Stamp Dam Jackson County | 27 | 1987 | Low | Not Rated |
| Stamp Dam Pottawattamie County | 35 | 2005 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.