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 151–175 of 415
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Montour Ash Basin No 1 Montour County | 40 | 1971 | High | Satisfactory |
| Mitchell Sludge Sedimentation Pond Washington County | 50 | 1982 | Significant | Satisfactory |
| Minsi Lake Northampton County | 27 | 1970 | High | Satisfactory |
| Mink Pond Pike County | 12 | 1919 | High | Satisfactory |
| Minersville No 3 Schuylkill County | 31 | 1856 | High | Satisfactory |
| Mine No 84 - Pond 6 West Dike Washington County | 26 | — | High | Satisfactory |
| Mine No 84 - Pond 6 Main Washington County | 185 | 1980 | High | Satisfactory |
| Mine No 84 - Pond 6 East Dike Washington County | 10 | — | High | Satisfactory |
| Mill Service No 6 Westmoreland County | 80 | 1986 | High | Satisfactory |
| Mill York County | 18 | 1863 | High | Satisfactory |
| Midfield Sedimentation Pond Allegheny County | 40 | 1988 | High | Satisfactory |
| Middle West Deer Allegheny County | 16 | — | High | Satisfactory |
| Middle Mang Wayne County | 17 | 1977 | Low | Satisfactory |
| Meadow Run Luzerne County | 17 | 1909 | High | Satisfactory |
| Meadow Grounds Fulton County | 43 | 1964 | High | Satisfactory |
| Mcdowell Detention Basin Erie County | 11 | 2004 | High | Satisfactory |
| Marshall Reservoir No. 2 Washington County | 37 | 1928 | Significant | Satisfactory |
| Maple Creek Slurry Pond No 2 - A Washington County | 91 | 1978 | High | Satisfactory |
| Maple Creek Slurry Pond 1 Washington County | 120 | 1973 | High | Satisfactory |
| 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 |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.