Pennsylvania Dams
1,481 dams tracked by the National Inventory of Dams
Total Dams
1,481
High Hazard
780
52.7%
Poor / Unsatisfactory
215
Average Age
80 yrs
Hazard Classification
High780 (52.7%)
Significant310 (20.9%)
Low378 (25.5%)
Condition Assessment
Satisfactory415 (28.0%)
Fair547 (36.9%)
Poor / Unsatisfactory215 (14.5%)
Not Rated304 (20.5%)
Federal
57
State
152
Local
351
Private
911
Tallest Dams
- Harmar Refuse Bank410 ft
- Little Blue Run400 ft
- Cumberland No. 1 Slurry Pond 1380 ft
- Cumberland No. 2 Slurry Pond370 ft
- Bailey Mine Area No. 3 Slurry337 ft
High Hazard Dams
Poor Condition Dams
- Little Pine CreekPoor
- North ForkPoor
- DehartPoor
- Mill RunPoor
- West Newton SludgeUnsatisfactory
All Dams in Pennsylvania
Showing 951–975 of 1,481
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Naylor Lower York County | 19 | — | Significant | Satisfactory |
| Naylor Middle York County | — | — | Significant | Satisfactory |
| Naylors Run Delaware County | 13 | 1975 | High | Satisfactory |
| Needle Lackawanna County | 11 | 1974 | Low | Poor |
| Neely Greene County | 30 | — | Low | Fair |
| Negley Perry County | 19 | 1973 | Low | Not Rated |
| Negro Pond Wyoming County | 7 | 1919 | High | Poor |
| Neifert Creek (Pa-422a) Schuylkill County | 55 | 1968 | High | Satisfactory |
| Nello L Teer Co Greene County | 18 | 1980 | Significant | Satisfactory |
| Nemacolin Washington County | 46 | 1964 | Low | Fair |
| Nesbitt Lackawanna County | 101 | 1903 | High | Satisfactory |
| Neshaminy Falls Bucks County | 14 | 1909 | Low | Satisfactory |
| Nesquehoning 4th Hollow Reservoir Carbon County | 51 | 1975 | High | Fair |
| Nevin Creek (Pa-451) Wayne County | 15 | 1972 | High | Fair |
| New Holland Reservoir Lancaster County | 40 | 1953 | High | Fair |
| New Kernsville Berks County | 45 | 1949 | High | Fair |
| Newport Plaza Perry County | 20 | — | High | Fair |
| Newtown (Pa-621) Bucks County | 44 | 1980 | High | Fair |
| Nick Pond Susquehanna County | 10 | 1996 | Significant | Satisfactory |
| No 1 Monroe County | 8 | — | Low | Poor |
| No 1 Dam Schuylkill County | 26 | 1915 | Low | Not Rated |
| No 5 Lackawanna County | 35 | 1888 | High | Poor |
| No 5 Northumberland County | 12 | 1896 | Low | Not Rated |
| Nockamixon Bucks County | 112 | 1973 | High | Fair |
| Norristown (Swede Street) Montgomery County | 12 | 1800 | Low | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.