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 626–650 of 1,481
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Marcel Lake Pike County | 23 | 1961 | High | Fair |
| Maple Lake Lackawanna County | 23 | 1893 | High | Fair |
| Maple Lake Pike County | 35 | 1972 | High | Fair |
| Maple Lake Sullivan County | 14 | 1954 | High | Fair |
| 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 |
| Manzanedo Monroe County | 12 | 1914 | Low | Fair |
| Manor Lake Bucks County | 9 | 1930 | Low | Poor |
| Manor Creek Farms Butler County | 18 | — | Significant | Not Rated |
| Mannitto Westmoreland County | 18 | — | Low | Not Rated |
| Manheim Twp Detention Basin No 2 Lancaster County | 15 | 1981 | High | Satisfactory |
| Manada Golf Club Pond Dauphin County | 14 | — | Significant | Fair |
| Mammoth Lake Westmoreland County | 15 | 1969 | High | Satisfactory |
| Malvern Preparatory Lower Chester County | 15 | 1923 | Significant | Satisfactory |
| Makefield Glen Detention B Bucks County | 12 | 1988 | Significant | Poor |
| Maiden Creek Reservoir Berks County | 15 | 1960 | Low | Fair |
| 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 |
| Madison Heights Butler County | 12 | 2005 | Low | Not Rated |
| Mackiewicz Tioga County | 15 | 1969 | Low | Not Available |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.