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 378
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Pa-106 Crawford County | 12 | 1978 | Low | Not Rated |
| Pa-104 Crawford County | 8 | 1975 | Low | Not Rated |
| Pa-103 Bradford County | 20 | 1974 | Low | Not Rated |
| Pa-102 Bradford County | 15 | 1974 | Low | Not Rated |
| Orchard Course No. 3 Impoundment Butler County | 20 | 1925 | Low | Not Rated |
| Orchard Course No. 2 Impoundment Butler County | 16 | 1994 | Low | Not Rated |
| Open Woods Pond Wayne County | 9 | 1932 | Low | Fair |
| Olympus Lake Luzerne County | 24 | 1937 | Low | Satisfactory |
| Oak Tree Mercer County | 24 | 1967 | Low | Not Rated |
| North Slurry Pond Washington County | 100 | — | Low | Not Available |
| Northampton Northampton County | 8 | 1927 | Low | Satisfactory |
| Norristown (Swede Street) Montgomery County | 12 | 1800 | Low | Satisfactory |
| No 5 Northumberland County | 12 | 1896 | Low | Not Rated |
| No 1 Dam Schuylkill County | 26 | 1915 | Low | Not Rated |
| No 1 Monroe County | 8 | — | Low | Poor |
| Neshaminy Falls Bucks County | 14 | 1909 | Low | Satisfactory |
| Nemacolin Washington County | 46 | 1964 | Low | Fair |
| Negley Perry County | 19 | 1973 | Low | Not Rated |
| Neely Greene County | 30 | — | Low | Fair |
| Needle Lackawanna County | 11 | 1974 | Low | Poor |
| Naus and Newlyn Monroe County | 20 | 1968 | Low | Fair |
| Nabbys Lake Wayne County | 16 | — | Low | Not Rated |
| Mud Pond Bradford County | 10 | 1940 | Low | Not Rated |
| Muddy Run Recreation Dam Lancaster County | 90 | 1967 | Low | Satisfactory |
| Morrisdale Mine Clearfield County | 12 | 1919 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.