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 176–200 of 415
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Malvern Preparatory Lower Chester County | 15 | 1923 | Significant | Satisfactory |
| Mahanoy Township No 2 Schuylkill County | 34 | 1991 | High | Satisfactory |
| Lyman Run Potter County | 53 | 2007 | High | Satisfactory |
| Lower West Deer Lake Allegheny County | 16 | — | High | Satisfactory |
| Lower Owl Creek Schuylkill County | 36 | 1883 | High | Satisfactory |
| Lower Birchwood Lake Pike County | 12 | 1960 | High | Satisfactory |
| Lovingood Greene County | 30 | — | Low | Satisfactory |
| Looney Lake Mercer County | 40 | 1952 | Significant | Satisfactory |
| Longstown Village York County | 16 | 1998 | Significant | Satisfactory |
| Longford Lake Susquehanna County | 37 | 1974 | High | Satisfactory |
| Lofty Reservoir Schuylkill County | 30 | 1897 | Significant | Satisfactory |
| Locust Ridge Hunting Club Clinton County | 22 | 1965 | Significant | Satisfactory |
| Locust Lake Monroe County | 12 | — | High | Satisfactory |
| Locklin Pond Wayne County | 13 | 1889 | High | Satisfactory |
| Loch Alsh Reservoir Montgomery County | 16 | 1915 | High | Satisfactory |
| Little Schuylkill River (Pa-422) Schuylkill County | 87 | 1968 | High | Satisfactory |
| Little Lehigh Lehigh County | 8 | 1919 | Low | Satisfactory |
| Little Blue Saddle Beaver County | 15 | 1977 | Significant | Satisfactory |
| Lingertots Pond Luzerne County | 10 | 1957 | Low | Satisfactory |
| Lindy Lake Susquehanna County | 23 | 1985 | High | Satisfactory |
| Lincoln Avenue Detention Basin Chester County | 13 | 2007 | High | Satisfactory |
| Lily Lake Luzerne County | 10 | 1973 | Low | Satisfactory |
| Lewis Lake Susquehanna County | 15 | 1835 | High | Satisfactory |
| Leonard George Greene County | 50 | 2001 | Low | Satisfactory |
| Lawrence Baker Sheppard York County | 75 | 1965 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.