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 251–275 of 780
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| No 5 Lackawanna County | 35 | 1888 | High | Poor |
| Newtown (Pa-621) Bucks County | 44 | 1980 | High | Fair |
| Newport Plaza Perry County | 20 | — | High | Fair |
| New Kernsville Berks County | 45 | 1949 | High | Fair |
| New Holland Reservoir Lancaster County | 40 | 1953 | High | Fair |
| Nevin Creek (Pa-451) Wayne County | 15 | 1972 | High | Fair |
| Nesquehoning 4th Hollow Reservoir Carbon County | 51 | 1975 | High | Fair |
| Nesbitt Lackawanna County | 101 | 1903 | High | Satisfactory |
| Neifert Creek (Pa-422a) Schuylkill County | 55 | 1968 | High | Satisfactory |
| Negro Pond Wyoming County | 7 | 1919 | High | Poor |
| Naylors Run Delaware County | 13 | 1975 | High | Satisfactory |
| Musser Forests Indiana County | 22 | 1952 | High | Fair |
| Muddy Run Intake Channel Dam Lancaster County | 35 | 1967 | High | Fair |
| Mount Laurel (Mud Run) Schuylkill County | 39 | 1879 | High | Satisfactory |
| Mount Airy Monroe County | 42 | 1974 | High | Poor |
| Mountaintop Lake #2 Monroe County | 12 | 1993 | High | Fair |
| Mountaintop Lake #1 Monroe County | 24 | 1993 | High | Fair |
| Mountain Springs Lake Monroe County | 18 | 1919 | High | Poor |
| Mountain Shadow Lake Columbia County | 20 | 1954 | High | Fair |
| Mountain Lake Luzerne County | 16 | 1910 | High | Fair |
| Mountain Lake Somerset County | 22 | 1956 | High | Fair |
| Mosquito Creek Lycoming County | 15 | 1890 | High | Fair |
| Morris Run No 3 Tioga County | 25 | 1920 | High | Poor |
| Moraine State Park Butler County | 55 | 1968 | High | Satisfactory |
| Moose Creek Reservoir Clearfield County | 31 | 1910 | High | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.