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 926–950 of 1,481
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Moose Creek Reservoir Clearfield County | 31 | 1910 | High | Poor |
| Moosic Lakes Lackawanna County | 12 | — | Significant | Poor |
| Moraine State Park Butler County | 55 | 1968 | High | Satisfactory |
| Morganza Washington County | 24 | 1991 | Low | Satisfactory |
| Morrisdale Mine Clearfield County | 12 | 1919 | Low | Not Rated |
| Morris Run No 3 Tioga County | 25 | 1920 | High | Poor |
| Mosquito Creek Lycoming County | 15 | 1890 | High | Fair |
| Mountain Lake Luzerne County | 16 | 1910 | High | Fair |
| Mountain Lake Somerset County | 22 | 1956 | High | Fair |
| Mountain Shadow Lake Columbia County | 20 | 1954 | High | Fair |
| Mountain Springs Dike Monroe County | 8 | 1919 | Undetermined | Not Rated |
| Mountain Springs Lake Monroe County | 18 | 1919 | High | Poor |
| Mountaintop Lake #1 Monroe County | 24 | 1993 | High | Fair |
| Mountaintop Lake #2 Monroe County | 12 | 1993 | High | Fair |
| Mountainview Orchards Pond Adams County | 25 | 1967 | Undetermined | Not Available |
| Mount Airy Monroe County | 42 | 1974 | High | Poor |
| Mount Laurel (Mud Run) Schuylkill County | 39 | 1879 | High | Satisfactory |
| Mt Morris Sportsmens Association Greene County | 20 | — | Significant | Satisfactory |
| Muddy Run Intake Channel Dam Lancaster County | 35 | 1967 | High | Fair |
| Muddy Run Recreation Dam Lancaster County | 90 | 1967 | Low | Satisfactory |
| Mud Pond Bradford County | 10 | 1940 | Low | Not Rated |
| Musser Forests Indiana County | 22 | 1952 | High | Fair |
| Myers Lackawanna County | 12 | 1938 | Significant | Fair |
| Nabbys Lake Wayne County | 16 | — | Low | Not Rated |
| Naus and Newlyn Monroe County | 20 | 1968 | Low | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.