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 351–375 of 780
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Long Run Reservoir No 1 Carbon County | 26 | 1885 | High | Fair |
| Long Pine Run Adams County | 112 | 1970 | High | Fair |
| Longford Lake Susquehanna County | 37 | 1974 | High | Satisfactory |
| Locust Lake Schuylkill County | 46 | 1954 | High | Fair |
| Locust Lake Monroe County | 12 | — | High | Satisfactory |
| Locust Creek (Pa-423) Schuylkill County | 98 | 1964 | High | Fair |
| Locklin Pond Wayne County | 13 | 1889 | High | Satisfactory |
| Loch Alsh Reservoir Montgomery County | 16 | 1915 | High | Satisfactory |
| Lloydell Cambria County | 43 | 1906 | High | Fair |
| Little Schuylkill River (Pa-422) Schuylkill County | 87 | 1968 | High | Satisfactory |
| Little Pine Creek Lycoming County | 113 | 1950 | High | Poor |
| Little Buffalo Creek Perry County | 52 | 1970 | High | Fair |
| Little Blue Run Beaver County | 400 | 1977 | High | Fair |
| Lindy Lake Susquehanna County | 23 | 1985 | High | Satisfactory |
| Lincoln Avenue Detention Basin Chester County | 13 | 2007 | High | Satisfactory |
| Ligonier Reservoir Westmoreland County | 35 | 1954 | High | Fair |
| Licking Creek Juniata County | 26 | — | High | Fair |
| Lewis Lake Susquehanna County | 15 | 1835 | High | Satisfactory |
| Leopard Lake Chester County | 11 | — | High | Fair |
| Lehman Lake Pike County | 10 | 1890 | High | Unsatisfactory |
| Leavitt Branch (Pa-463) Monroe County | 90 | 1976 | High | Poor |
| Leaser Lake Lehigh County | 56 | 1971 | High | Fair |
| Lawrence Baker Sheppard York County | 75 | 1965 | High | Satisfactory |
| Laurel Run Reservoir Elk County | 84 | 1970 | High | Poor |
| Laurel Run No 2 Luzerne County | 37 | 1885 | High | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.