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 1351–1375 of 1,481
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Tubmill Westmoreland County | 40 | 1907 | High | Fair |
| Tuscarora Lake Susquehanna County | 12 | 1919 | High | Fair |
| Twin Lakes Elk County | 29 | 1936 | Significant | Not Rated |
| Twin Lakes No 1 Westmoreland County | 31 | 1908 | High | Satisfactory |
| Twin Lakes No 2 Westmoreland County | 34 | 1910 | High | Satisfactory |
| Two Lick Creek Indiana County | 90 | 1968 | High | Satisfactory |
| Two Mile Run Venango County | 85 | 1971 | High | Fair |
| Tyler Lake Susquehanna County | 6 | 1919 | Significant | Fair |
| Tyrone Reservoir #2 Blair County | 51 | 1912 | High | Fair |
| Unger Wayne County | 9 | 1947 | Significant | Poor |
| Union City Dam Erie County | 88 | 1971 | High | Not Available |
| Union City Reservoir Erie County | 36 | 1935 | High | Poor |
| University Park Airport Pond 1a Centre County | 24 | 1995 | High | Poor |
| University Park Airport Pond 4a Centre County | 29 | 1998 | Significant | Fair |
| Unknown Dam Mercer County | 12 | 1963 | Low | Not Available |
| Unknown Dam Lancaster County | 31 | 1968 | Low | Not Available |
| Unknown Dam Huntingdon County | 24 | 1968 | Low | Not Available |
| Upper Northampton County | 11 | 1917 | Low | Fair |
| Upper Perry County | 22 | 1919 | Low | Not Rated |
| Upper Birchwood Lake Pike County | 23 | — | High | Poor |
| Upper Boone Lake Sullivan County | 18 | 1972 | High | Fair |
| Upper Castanea Reservoir Clinton County | 30 | 1869 | High | Unsatisfactory |
| Upper Kittanning Blair County | 45 | 1887 | High | Fair |
| Upper Mount Pleasant Luzerne County | 20 | 1882 | High | Poor |
| Upper Owl Creek Schuylkill County | 43 | 1921 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.