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 1301–1325 of 1,481
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Susquehanna Woods Lower Montgomery County | 14 | 2005 | High | Fair |
| Sutula/Stroud Allegheny County | 13 | — | Significant | Satisfactory |
| Suydam (Pa-418) Wayne County | 24 | 1960 | High | Satisfactory |
| Swartz Cambria County | 13 | — | Significant | Not Rated |
| Swatara Dauphin County | 10 | 1935 | Low | Not Rated |
| Sweet Arrow Lake Schuylkill County | 36 | 1923 | High | Satisfactory |
| Sweetwater Lake Monroe County | 8 | 1983 | High | Poor |
| Sweny Erie County | 24 | 1983 | Low | Not Rated |
| Swimming Bradford County | 12 | — | Low | Not Rated |
| Tamarack Lake A (Pa-461a) Crawford County | 23 | 1962 | High | Unsatisfactory |
| Tamarack Lake B (Pa-461b) Crawford County | 21 | 1962 | High | Fair |
| Tanglwood Lake Pike County | 18 | 1965 | High | Fair |
| Taxiway "E" Detention Basin Allegheny County | 84 | 1996 | Significant | Satisfactory |
| Taylor Pond (Pa-446) Pike County | 76 | 1963 | High | Fair |
| Taylor Run Tioga County | 33 | — | Low | Not Rated |
| Thomas Monroe County | 10 | 1982 | Significant | Poor |
| Thomas Creek (Rc & D-105) Susquehanna County | 24 | 1978 | High | Satisfactory |
| Thomas Meeting Detention Basin Chester County | 5 | 1990 | Significant | Fair |
| Thomas W Koon Bedford County | 92 | 1932 | High | Satisfactory |
| Thorn Hill Park Detention Basin Allegheny County | 18 | 1987 | Significant | Fair |
| Thorn Run Butler County | 40 | 1903 | High | Satisfactory |
| Thorn Run Westmoreland County | 22 | 1981 | Low | Satisfactory |
| Timber Chester County | 19 | 1986 | Significant | Satisfactory |
| Timber Creek Condo Montgomery County | 10 | 1985 | Significant | Fair |
| Timber Lake Washington County | 17 | 1990 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.