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 547
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mican Pond Wayne County | 8 | 1932 | Significant | Fair |
| Middle Lake Susquehanna County | 7 | 1914 | Low | Fair |
| Mill Club Delaware County | 22 | 1908 | Significant | Fair |
| Mill Creek Bradford County | 12 | 1954 | High | Fair |
| Mill Creek Luzerne County | 74 | 1898 | High | Fair |
| Mill Creek Detention Basin Montgomery County | 11 | 1986 | High | Fair |
| Miller Pond Wayne County | 25 | 1867 | High | Fair |
| Millers Berks County | 21 | 1975 | High | Fair |
| Mill Pond Wayne County | 10 | 1917 | Significant | Fair |
| Mill Pond Pike County | 29 | 1929 | High | Fair |
| Mill Rift Pond Pike County | 22 | 1886 | High | Fair |
| Milltown Chester County | 20 | 1924 | High | Fair |
| Millwater Berks County | 26 | 1955 | High | Fair |
| Mine No 84 - Pond 7 Washington County | 36 | 1980 | Significant | Fair |
| Mingo Lake Susquehanna County | 15 | 1895 | Low | Fair |
| Monroe Lake Monroe County | 12 | 1926 | High | Fair |
| Mosquito Creek Lycoming County | 15 | 1890 | High | Fair |
| Mountain Lake Somerset County | 22 | 1956 | High | Fair |
| Mountain Lake Luzerne County | 16 | 1910 | High | Fair |
| Mountain Shadow Lake Columbia County | 20 | 1954 | High | Fair |
| Mountaintop Lake #1 Monroe County | 24 | 1993 | High | Fair |
| Mountaintop Lake #2 Monroe County | 12 | 1993 | High | Fair |
| Muddy Run Intake Channel Dam Lancaster County | 35 | 1967 | High | Fair |
| Musser Forests Indiana County | 22 | 1952 | High | Fair |
| Myers Lackawanna County | 12 | 1938 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.