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 126–150 of 310
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Monteville Jefferson County | — | — | Significant | Not Rated |
| Mitchell Sludge Sedimentation Pond Washington County | 50 | 1982 | Significant | Satisfactory |
| Mine No 84 - Pond 7 Washington County | 36 | 1980 | Significant | Fair |
| Mill Pond Wayne County | 10 | 1917 | Significant | Fair |
| Mill Club Delaware County | 22 | 1908 | Significant | Fair |
| Mican Pond Wayne County | 8 | 1932 | Significant | Fair |
| Meadow Lake Monroe County | 14 | 1916 | Significant | Fair |
| Mcdonaldton Somerset County | 16 | 1911 | Significant | Fair |
| Mcconnell Lake Pike County | 16 | 1957 | Significant | Fair |
| Maxwell Locks and Dam Washington County | 56 | 1964 | Significant | Not Available |
| Mathies Sediment Pond No 5 Washington County | 33 | 1982 | Significant | Fair |
| Martins Creek Ses Ash Basin No 4 Northampton County | 43 | 1989 | Significant | Fair |
| Marshall Reservoir No. 2 Washington County | 37 | 1928 | Significant | Satisfactory |
| Manor Creek Farms Butler County | 18 | — | Significant | Not Rated |
| Manada Golf Club Pond Dauphin County | 14 | — | Significant | Fair |
| Malvern Preparatory Lower Chester County | 15 | 1923 | Significant | Satisfactory |
| Makefield Glen Detention B Bucks County | 12 | 1988 | Significant | Poor |
| Lowe Lake Susquehanna County | 5 | 1917 | Significant | Fair |
| Lost Creek Somerset County | 18 | 1954 | Significant | Fair |
| Looney Lake Mercer County | 40 | 1952 | Significant | Satisfactory |
| Longstown Village York County | 16 | 1998 | Significant | Satisfactory |
| Lofty Reservoir Schuylkill County | 30 | 1897 | Significant | Satisfactory |
| Locust Ridge Hunting Club Clinton County | 22 | 1965 | Significant | Satisfactory |
| Little Sugar Run Westmoreland County | 25 | — | Significant | Not Rated |
| Little Keen Pond Wayne County | 12 | 1902 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.