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 976–1000 of 1,481
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Northampton Northampton County | 8 | 1927 | Low | Satisfactory |
| North Arrowhead Lake Monroe County | 21 | 1971 | High | Satisfactory |
| North Branch Dunlap Creek (Pa-470) Fayette County | 57 | 1974 | High | Satisfactory |
| North Fork Somerset County | 105 | 1932 | High | Poor |
| North Fork (Pa-406) Potter County | 58 | 1960 | High | Fair |
| North Lake Pike County | 18 | 1972 | High | Poor |
| North Low Dissolved Solids Imp Beaver County | 32 | 1974 | Significant | Satisfactory |
| Northmont Farms Basin #1 Allegheny County | 24 | 1986 | High | Satisfactory |
| Northmoreland Lake (Pa-117) Westmoreland County | 38 | 1989 | High | Satisfactory |
| North Slurry Pond Washington County | 100 | — | Low | Not Available |
| Oakford Glen Lackawanna County | 22 | — | Significant | Satisfactory |
| Oakland Susquehanna County | 18 | 1896 | Significant | Not Rated |
| Oak Tree Mercer County | 24 | 1967 | Low | Not Rated |
| Oakwood Lake Wyoming County | 12 | 1947 | High | Satisfactory |
| Olympus Lake Luzerne County | 24 | 1937 | Low | Satisfactory |
| Olyphant No 2 Lackawanna County | 55 | 1888 | Significant | Fair |
| Olyphant No 3 Lackawanna County | 38 | 1898 | Significant | Fair |
| Open Woods Pond Wayne County | 9 | 1932 | Low | Fair |
| Opossum Lake Cumberland County | 38 | 1961 | High | Satisfactory |
| Orchard Course No. 2 Impoundment Butler County | 16 | 1994 | Low | Not Rated |
| Orchard Course No. 3 Impoundment Butler County | 20 | 1925 | Low | Not Rated |
| Orchard Hill Washington County | 23 | 1965 | Significant | Satisfactory |
| Orchard Park Meadows Retention Bas Allegheny County | 21 | 1989 | High | Fair |
| Orson Pond Wayne County | 16 | 1849 | Significant | Fair |
| Osborne Lagoon Chester County | 50 | 2012 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.