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 901–925 of 1,481
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mill Pond Wayne County | 10 | 1917 | Significant | Fair |
| Mill Rift Pond Pike County | 22 | 1886 | High | Fair |
| Mill Run Blair County | 100 | 1957 | High | Poor |
| Mill Service No 5 Westmoreland County | 75 | 1976 | Low | Not Rated |
| Mill Service No 6 Westmoreland County | 80 | 1986 | High | Satisfactory |
| Milltown Chester County | 20 | 1924 | High | Fair |
| Millwater Berks County | 26 | 1955 | High | Fair |
| Mine 33 Sed Pond No. 1 Cambria County | 32 | — | Low | Not Available |
| Mine No 84 - Pond 6 East Dike Washington County | 10 | — | High | Satisfactory |
| Mine No 84 - Pond 6 Main Washington County | 185 | 1980 | High | Satisfactory |
| Mine No 84 - Pond 6 West Dike Washington County | 26 | — | High | Satisfactory |
| Mine No 84 - Pond 7 Washington County | 36 | 1980 | Significant | Fair |
| Minersville No 3 Schuylkill County | 31 | 1856 | High | Satisfactory |
| Minersville No 4 Schuylkill County | 36 | 1912 | High | Poor |
| Mingo Lake Susquehanna County | 15 | 1895 | Low | Fair |
| Mink Pond Pike County | 12 | 1919 | High | Satisfactory |
| Minsi Lake Northampton County | 27 | 1970 | High | Satisfactory |
| Mitchell Sludge Sedimentation Pond Washington County | 50 | 1982 | Significant | Satisfactory |
| Monroe Lake Monroe County | 12 | 1926 | High | Fair |
| Monteville Jefferson County | — | — | Significant | Not Rated |
| Montgomery Clearfield County | 71 | 1960 | High | Poor |
| Montgomery Locks and Dam Beaver County | 62 | 1936 | Significant | Not Available |
| Montour Ash Basin No 1 Montour County | 40 | 1971 | High | Satisfactory |
| Montour Heights Country Club Allegheny County | 54 | 1987 | Significant | Satisfactory |
| Moon Lake Schuylkill County | 12 | — | High | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.