Browse Dams
1,492 dams in the National Inventory of Dams.
National Inventory of Dams
Browse 1,492 dams from the NID database. Each record includes dam name, location, physical dimensions, hazard potential classification, condition assessment, purpose, owner information, and emergency action plan status. Use the filters below to search by state, hazard level, condition, or keyword.
| Name | State | County | Height (ft) | Hazard | Condition | Year | Purpose |
|---|---|---|---|---|---|---|---|
| Canonsburg No 2 | Pennsylvania | Washington | 36 | High | Poor | 1932 | Recreation |
| Lower | Pennsylvania | Fayette | 36 | High | Poor | 1906 | Recreation |
| Pond No 2 | Pennsylvania | Chester | 36 | Low | Poor | — | Tailings |
| Sweet Arrow Lake | Pennsylvania | Schuylkill | 36 | High | Satisfactory | 1923 | Recreation |
| Whetstone No 2 Storage | Pennsylvania | Elk | 36 | High | Satisfactory | 1962 | Water Supply |
| Minersville No 4 | Pennsylvania | Schuylkill | 36 | High | Poor | 1912 | Water Supply |
| Pickering Creek | Pennsylvania | Chester | 36 | High | Fair | 1928 | Water Supply |
| Mine No 84 - Pond 7 | Pennsylvania | Washington | 36 | Significant | Fair | 1980 | Debris Control |
| Lower Owl Creek | Pennsylvania | Schuylkill | 36 | High | Satisfactory | 1883 | Water Supply |
| Union City Reservoir | Pennsylvania | Erie | 36 | High | Poor | 1935 | Water Supply |
| Andy | Pennsylvania | Washington | 35 | Low | Satisfactory | — | Recreation |
| Canoe Creek | Pennsylvania | Blair | 35 | High | Fair | 1971 | Recreation |
| Ligonier Reservoir | Pennsylvania | Westmoreland | 35 | High | Fair | 1954 | Water Supply |
| Conemaugh Township Impounding | Pennsylvania | Somerset | 35 | Low | Not Rated | 1961 | Recreation |
| David Mine Sedimentation Pond No 2 | Pennsylvania | Armstrong | 35 | High | Fair | 1989 | Other |
| Area 3/4 Lower Sed Pond | Pennsylvania | Greene | 35 | Low | Satisfactory | 2004 | Other |
| Graterford Sewage Lagoons | Pennsylvania | Montgomery | 35 | Significant | Fair | 1986 | Other |
| Diamond Lake | Pennsylvania | Greene | 35 | Low | Fair | — | Recreation |
| Speedwell Forge | Pennsylvania | Lancaster | 35 | High | Satisfactory | 1966 | Recreation |
| Ridgebury Lake | Pennsylvania | Bradford | 35 | High | Fair | 1973 | Recreation |
| Muddy Run Intake Channel Dam | Pennsylvania | Lancaster | 35 | High | Fair | 1967 | Hydroelectric |
| Mill Creek Intake | Pennsylvania | Luzerne | 35 | Low | Not Rated | 1914 | Recreation |
| Bear Creek Lake | Pennsylvania | Carbon | 35 | High | Fair | 1964 | Recreation |
| No 5 | Pennsylvania | Lackawanna | 35 | High | Poor | 1888 | Grade Stabilization |
| Hawk Mountain | Pennsylvania | Schuylkill | 35 | High | Fair | 1978 | Recreation |
| Hosensock (Pa-424) | Pennsylvania | Schuylkill | 35 | High | Fair | 1960 | Flood Risk Reduction |
| Maple Lake | Pennsylvania | Pike | 35 | High | Fair | 1972 | Recreation |
| Carbaugh Run | Pennsylvania | Adams | 35 | High | Poor | 1960 | Water Supply |
| Wisecarver | Pennsylvania | Greene | 35 | High | Satisfactory | 1931 | Water Supply |
| Patsys Lake | Pennsylvania | Fayette | 35 | High | Satisfactory | 1900 | Recreation |
| Lake Choctaw | Pennsylvania | Schuylkill | 34 | High | Poor | 1974 | Recreation |
| White Heron | Pennsylvania | Monroe | 34 | High | Satisfactory | 1930 | Recreation |
| Lake Julia | Pennsylvania | Fayette | 34 | High | Satisfactory | 1965 | Recreation |
| Railroad Creek (Pa-615) | Pennsylvania | Bucks | 34 | High | Fair | 1977 | Flood Risk Reduction |
| Scotts Run | Pennsylvania | Berks | 34 | High | Fair | 1953 | Recreation |
| Duncan Ave West Flood Control | Pennsylvania | Allegheny | 34 | Significant | Satisfactory | — | Flood Risk Reduction |
| Penn Lake | Pennsylvania | Luzerne | 34 | High | Poor | 1905 | Recreation |
| Lake Latonka | Pennsylvania | Mercer | 34 | High | Satisfactory | 1966 | Recreation |
| Virgin Run | Pennsylvania | Fayette | 34 | Significant | Poor | 1953 | Recreation |
| Smith Reservoir | Pennsylvania | Erie | 34 | High | Satisfactory | 1925 | Water Supply |
| Park Place No 3 | Pennsylvania | Schuylkill | 34 | High | Fair | 1909 | Water Supply |
| Twin Lakes No 2 | Pennsylvania | Westmoreland | 34 | High | Satisfactory | 1910 | Recreation |
| Peach Bottom Atomic Power | Pennsylvania | York | 34 | Low | Not Rated | 1973 | Debris Control |
| Todd Spring Reservoir | Pennsylvania | Bedford | 34 | High | Poor | 1898 | Water Supply |
| Township Line (Airport Road) | Pennsylvania | Chester | 34 | High | Fair | 1935 | Recreation |
| Wolf Creek | Pennsylvania | Clearfield | 34 | High | Fair | 1971 | Recreation |
| Trout Run No 4 | Pennsylvania | Northumberland | 34 | High | Fair | 1882 | Water Supply |
| Shenandoah Creek | Pennsylvania | Schuylkill | 34 | Low | Satisfactory | 1935 | Recreation |
| Shohola Marsh | Pennsylvania | Pike | 34 | High | Fair | 1968 | Recreation |
| Mahanoy Township No 2 | Pennsylvania | Schuylkill | 34 | High | Satisfactory | 1991 | Water Supply |
Frequently Asked Questions
Hazard potential is based on the consequences of dam failure, not the condition of the dam. High hazard means loss of human life is probable. Significant means economic and environmental losses are expected but no probable loss of life. Low means minimal losses are expected. The classification considers downstream population, infrastructure, and environmental resources.
Condition ratings reflect the physical state of the dam based on periodic inspections. Satisfactory means no deficiencies found. Fair means minor issues exist but no immediate action needed. Poor means safety deficiencies require remedial action. Unsatisfactory means the dam is unsafe and immediate corrective action is required.
Yes. Use the search field above to find dams by name. You can also combine the search with state, hazard, and condition filters to narrow your results. Each dam record links to a detail page with complete information.