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 751–775 of 1,481
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Laurel Lake Cumberland County | 25 | 1968 | High | Fair |
| Laurel Ridge Lake Somerset County | 18 | 1956 | Low | Not Rated |
| Laurel Run Lackawanna County | 44 | 1894 | High | Fair |
| Laurel Run No 2 Luzerne County | 37 | 1885 | High | Poor |
| Laurel Run Reservoir Elk County | 84 | 1970 | High | Poor |
| Laurelwood Butler County | 14 | 1993 | Significant | Not Rated |
| Laurel Wood Westmoreland County | 25 | — | Low | Fair |
| Lawrence Baker Sheppard York County | 75 | 1965 | High | Satisfactory |
| Lawson Wyoming County | 28 | 1970 | Low | Not Available |
| Leachate Equalization Impoundment Elk County | 95 | 1992 | Low | Not Rated |
| Leaser Lake Lehigh County | 56 | 1971 | High | Fair |
| Leavitt Branch (Pa-463) Monroe County | 90 | 1976 | High | Poor |
| Lee Smith Dam Susquehanna County | 19 | 1964 | Low | Not Available |
| Lehigh Coal & Navigation CO - #14 Plant Schuylkill County | 80 | — | Significant | Not Available |
| Lehman Lake Pike County | 10 | 1890 | High | Unsatisfactory |
| Lenape Lake Monroe County | 8 | 1927 | Low | Poor |
| Leonard George Greene County | 50 | 2001 | Low | Satisfactory |
| Leopard Lake Chester County | 11 | — | High | Fair |
| Lewis Greene County | 20 | — | Significant | Fair |
| Lewis Lake Susquehanna County | 15 | 1835 | High | Satisfactory |
| Lewis Pond Tioga County | 16 | 1971 | Low | Not Available |
| Licking Creek Juniata County | 26 | — | High | Fair |
| Ligonier Reservoir Westmoreland County | 35 | 1954 | High | Fair |
| Lily Lake Luzerne County | 10 | 1973 | Low | Satisfactory |
| Lily Pond Pike County | 13 | 1898 | Low | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.