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 1376–1400 of 4,124
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Pony Creek Watershed Site 15 Mills County | 48 | 1965 | Low | Not Rated |
| Pony Creek Watershed Site 11 Mills County | 53 | 1963 | Low | Not Rated |
| Pony Creek Watershed Site 10 Mills County | 60 | 1966 | Significant | Satisfactory |
| Pontier Dam Warren County | 26 | 1994 | Low | Not Rated |
| Pollmiller Park Dam Lee County | 31 | 1971 | Low | Not Rated |
| Polk County Roadgrade Dam 5-80-22 Polk County | 35 | 1996 | Low | Not Rated |
| Polk County Roadgrade Dam 3-80-24 Polk County | 49 | 1992 | Low | Not Rated |
| Polk County Roadgrade Dam 21-78-22 Polk County | 41 | 1992 | Low | Not Rated |
| Plotz Dam Johnson County | 28 | 1968 | Low | Not Rated |
| Pleasant Valley Subwtrshd #2 Sta 50+00 Ida County | 30 | 1963 | Low | Not Rated |
| Pleasant Valley Subwtrshd #2a Sta 79+48 Ida County | 33 | 1963 | Low | Not Rated |
| Pleasant Valley Subwtrshd #1 Sta 53+70 Ida County | 35 | 1963 | Low | Not Rated |
| Pleasant Valley Subwtrshd #1j Sta 34+40 Ida County | 24 | 1963 | Low | Not Rated |
| Pleasant Valley Subwtrshd 1j-4550 Ida County | 38 | 1963 | Low | Not Rated |
| Pleasant Valley Subwtrshd #1c Sta 52+70 Ida County | 28 | 1963 | Low | Not Rated |
| Pleasant Valley Subwtrshd #1a Sta 139+4 Ida County | 32 | 1963 | Low | Not Rated |
| Pleasant Dam Clarke County | 43 | 1969 | Low | Not Rated |
| Pleasant Creek Lake Dam Linn County | 73 | 1977 | High | Satisfactory |
| Plagge Dam Monona County | 36 | 1998 | Low | Not Rated |
| Pioneer Park Pond Dam Page County | 25 | 1950 | Low | Not Rated |
| Pilot Rock Subwtrshd Sta 45+48 #2 Cherokee County | 33 | 1963 | Low | Not Rated |
| Pilot Rock Subwtrshd Sta 33+37 #1 Cherokee County | 43 | 1963 | Low | Not Rated |
| Pilot Rock Subwtrshd Sta 30+40 #1-C Cherokee County | 38 | 1963 | Low | Not Rated |
| Pilot Knob Lake Dam Hancock County | 18 | 1972 | Low | Satisfactory |
| Pilling Dam Pottawattamie County | 33 | 2003 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.