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 251–275 of 310
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Slade Allegheny County | 17 | — | Significant | Satisfactory |
| Slurry Pond #2 Indiana County | 40 | — | Significant | Not Available |
| Smith and Ponzo Washington County | 24 | 1939 | Significant | Fair |
| Snyder Lake Susquehanna County | 25 | 1971 | Significant | Not Available |
| Somerset Lakes Basin No 2 Chester County | 12 | 1991 | Significant | Fair |
| South Low Dissolved Solids Imp Beaver County | 32 | 1974 | Significant | Satisfactory |
| Spangenberg Lake Lackawanna County | 15 | 1949 | Significant | Fair |
| Spencer Mill Susquehanna County | 16 | 1919 | Significant | Poor |
| Spring Hill Cumberland County | 18 | 1970 | Significant | Not Rated |
| Starlight Lake Wayne County | 9 | 1880 | Significant | Fair |
| Stony Run Union County | 39 | — | Significant | Not Rated |
| Stookey Wayne County | 10 | — | Significant | Fair |
| Stoughton Lake Somerset County | 23 | 1951 | Significant | Satisfactory |
| Stoyers Schuylkill County | 8 | — | Significant | Fair |
| Stump Pond Sullivan County | 7 | — | Significant | Not Rated |
| Summit Lake No 1 Monroe County | 8 | 1919 | Significant | Satisfactory |
| Sunny Brook Estates # 1 Montgomery County | 14 | 1999 | Significant | Fair |
| Sunrise Lake Pike County | 14 | 1970 | Significant | Fair |
| Sunrise Lake Dike Pike County | 8 | 1970 | Significant | Fair |
| Sutula/Stroud Allegheny County | 13 | — | Significant | Satisfactory |
| Swartz Cambria County | 13 | — | Significant | Not Rated |
| Taxiway "E" Detention Basin Allegheny County | 84 | 1996 | Significant | Satisfactory |
| Thomas Monroe County | 10 | 1982 | Significant | Poor |
| Thomas Meeting Detention Basin Chester County | 5 | 1990 | Significant | Fair |
| Thorn Hill Park Detention Basin Allegheny County | 18 | 1987 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.