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 126–150 of 415
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Opossum Lake Cumberland County | 38 | 1961 | High | Satisfactory |
| Olympus Lake Luzerne County | 24 | 1937 | Low | Satisfactory |
| Oakwood Lake Wyoming County | 12 | 1947 | High | Satisfactory |
| Oakford Glen Lackawanna County | 22 | — | Significant | Satisfactory |
| Northmoreland Lake (Pa-117) Westmoreland County | 38 | 1989 | High | Satisfactory |
| Northmont Farms Basin #1 Allegheny County | 24 | 1986 | High | Satisfactory |
| North Low Dissolved Solids Imp Beaver County | 32 | 1974 | Significant | Satisfactory |
| North Branch Dunlap Creek (Pa-470) Fayette County | 57 | 1974 | High | Satisfactory |
| North Arrowhead Lake Monroe County | 21 | 1971 | High | Satisfactory |
| Northampton Northampton County | 8 | 1927 | Low | Satisfactory |
| Norristown (Swede Street) Montgomery County | 12 | 1800 | Low | Satisfactory |
| Nick Pond Susquehanna County | 10 | 1996 | Significant | Satisfactory |
| Neshaminy Falls Bucks County | 14 | 1909 | Low | Satisfactory |
| Nesbitt Lackawanna County | 101 | 1903 | High | Satisfactory |
| Nello L Teer Co Greene County | 18 | 1980 | Significant | Satisfactory |
| Neifert Creek (Pa-422a) Schuylkill County | 55 | 1968 | High | Satisfactory |
| Naylors Run Delaware County | 13 | 1975 | High | Satisfactory |
| Naylor Middle York County | — | — | Significant | Satisfactory |
| Naylor Lower York County | 19 | — | Significant | Satisfactory |
| Muddy Run Recreation Dam Lancaster County | 90 | 1967 | Low | Satisfactory |
| Mt Morris Sportsmens Association Greene County | 20 | — | Significant | Satisfactory |
| Mount Laurel (Mud Run) Schuylkill County | 39 | 1879 | High | Satisfactory |
| Morganza Washington County | 24 | 1991 | Low | Satisfactory |
| Moraine State Park Butler County | 55 | 1968 | High | Satisfactory |
| Montour Heights Country Club Allegheny County | 54 | 1987 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.