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 176–200 of 1,481
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Sweet Arrow Lake Schuylkill County | 36 | 1923 | High | Satisfactory |
| Swatara Dauphin County | 10 | 1935 | Low | Not Rated |
| Swartz Cambria County | 13 | — | Significant | Not Rated |
| Suydam (Pa-418) Wayne County | 24 | 1960 | High | Satisfactory |
| Sutula/Stroud Allegheny County | 13 | — | Significant | Satisfactory |
| Susquehanna Woods Lower Montgomery County | 14 | 2005 | High | Fair |
| Sunset Lake Columbia County | 12 | — | Low | Not Rated |
| Sunrise Lake Dike Pike County | 8 | 1970 | Significant | Fair |
| Sunrise Lake Pike County | 14 | 1970 | Significant | Fair |
| Sunrise Lake Luzerne County | 27 | 1962 | Low | Satisfactory |
| Sunnyside Energy Park Jefferson County | 50 | 1975 | High | Fair |
| Sunny Brook Estates # 1 Montgomery County | 14 | 1999 | Significant | Fair |
| Sun Mountain Lake Monroe County | 13 | 1934 | High | Fair |
| Summit Lake Reservoir Lackawanna County | 30 | 1875 | High | Fair |
| Summit Lake No 2 Monroe County | 10 | 1919 | Low | Fair |
| Summit Lake No 1 Monroe County | 8 | 1919 | Significant | Satisfactory |
| Sullivan Sullivan County | 11 | 1948 | Low | Not Rated |
| Sugar Run Westmoreland County | 60 | 1907 | High | Satisfactory |
| Sugar Creek Bradford County | 15 | 1956 | High | Satisfactory |
| Stump Pond Sullivan County | 7 | — | Significant | Not Rated |
| Strodes Run Mifflin County | 21 | 1946 | Low | Not Rated |
| Stoyers Schuylkill County | 8 | — | Significant | Fair |
| Stoughton Lake Somerset County | 23 | 1951 | Significant | Satisfactory |
| Stouffer Lake Lebanon County | 18 | 1949 | High | Fair |
| Stookey Wayne County | 10 | — | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.