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 326–350 of 780
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Maple Creek Silt Pond B Washington County | 43 | 1977 | High | Satisfactory |
| Maple Creek Silt Pond A Washington County | 39 | 1977 | High | Satisfactory |
| Maple Creek #3 Slurry Pond #2 Washington County | 83 | — | High | Satisfactory |
| Maple Creek #3 Slurry Pond #1 Washington County | 115 | — | High | Satisfactory |
| Manheim Twp Detention Basin No 2 Lancaster County | 15 | 1981 | High | Satisfactory |
| Mammoth Lake Westmoreland County | 15 | 1969 | High | Satisfactory |
| Mahoning Creek Dam Armstrong County | 162 | 1941 | High | Not Available |
| Mahanoy Township No 2 Schuylkill County | 34 | 1991 | High | Satisfactory |
| Maggio Estate No 2 Lycoming County | 29 | 1953 | High | Poor |
| Lyman Run Potter County | 53 | 2007 | High | Satisfactory |
| Loyalhanna Dam Westmoreland County | 120 | 1942 | High | Not Available |
| Lower Woods Pond Wayne County | 21 | 1848 | High | Poor |
| Lower West Deer Lake Allegheny County | 16 | — | High | Satisfactory |
| Lower Tumbling Run Schuylkill County | 49 | 1832 | High | Poor |
| Lower Ridge Westmoreland County | 20 | 1915 | High | Poor |
| Lower Rickards Pike County | 12 | 1955 | High | Fair |
| Lower (Pa-487a) Crawford County | 20 | 1973 | High | Fair |
| Lower Owl Creek Schuylkill County | 36 | 1883 | High | Satisfactory |
| Lower Mount Pleasant Luzerne County | 28 | 1882 | High | Poor |
| Lower Lake Pike County | 23 | 1959 | High | Fair |
| Lower Hemlock Lake Pike County | 15 | 1947 | High | Fair |
| Lower Birchwood Lake Pike County | 12 | 1960 | High | Satisfactory |
| Lower Alford Lake Susquehanna County | 15 | 1919 | High | Poor |
| Lower Fayette County | 36 | 1906 | High | Poor |
| Lovelass Wayne County | 20 | 1919 | High | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.