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 |
|---|---|---|---|---|---|---|---|
| Jeannette (Mountain Valley Lake) | Pennsylvania | Westmoreland | 36 | Significant | Fair | 1889 | Recreation |
| Canonsburg No 2 | Pennsylvania | Washington | 36 | High | Poor | 1932 | Recreation |
| Whetstone No 2 Storage | Pennsylvania | Elk | 36 | High | Satisfactory | 1962 | Water Supply |
| Lower | Pennsylvania | Fayette | 36 | High | Poor | 1906 | Recreation |
| C.W. Bill Young Lock and Dam | Pennsylvania | Allegheny | 36 | Significant | Not Available | 1934 | Navigation |
| Lower Owl Creek | Pennsylvania | Schuylkill | 36 | High | Satisfactory | 1883 | Water Supply |
| Union City Reservoir | Pennsylvania | Erie | 36 | High | Poor | 1935 | 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 |
| Sweet Arrow Lake | Pennsylvania | Schuylkill | 36 | High | Satisfactory | 1923 | Recreation |
| Muddy Run Intake Channel Dam | Pennsylvania | Lancaster | 35 | High | Fair | 1967 | Hydroelectric |
| Canoe Creek | Pennsylvania | Blair | 35 | High | Fair | 1971 | Recreation |
| Conemaugh Township Impounding | Pennsylvania | Somerset | 35 | Low | Not Rated | 1961 | Recreation |
| Hawk Mountain | Pennsylvania | Schuylkill | 35 | High | Fair | 1978 | Recreation |
| Ligonier Reservoir | Pennsylvania | Westmoreland | 35 | High | Fair | 1954 | Water Supply |
| Maple Lake | Pennsylvania | Pike | 35 | High | Fair | 1972 | Recreation |
| Diamond Lake | Pennsylvania | Greene | 35 | Low | Fair | - | Recreation |
| Hosensock (Pa-424) | Pennsylvania | Schuylkill | 35 | High | Fair | 1960 | Flood Risk Reduction |
| David Mine Sedimentation Pond No 2 | Pennsylvania | Armstrong | 35 | High | Fair | 1989 | Other |
| Ridgebury Lake | Pennsylvania | Bradford | 35 | High | Fair | 1973 | Recreation |
| Andy | Pennsylvania | Washington | 35 | Low | Satisfactory | - | Recreation |
| Graterford Sewage Lagoons | Pennsylvania | Montgomery | 35 | Significant | Fair | 1986 | Other |
| Wisecarver | Pennsylvania | Greene | 35 | High | Satisfactory | 1931 | Water Supply |
| Speedwell Forge | Pennsylvania | Lancaster | 35 | High | Satisfactory | 1966 | Recreation |
| Area 3/4 Lower Sed Pond | Pennsylvania | Greene | 35 | Low | Satisfactory | 2004 | Other |
| No 5 | Pennsylvania | Lackawanna | 35 | High | Poor | 1888 | Grade Stabilization |
| Carbaugh Run | Pennsylvania | Adams | 35 | High | Poor | 1960 | Water Supply |
| Mill Creek Intake | Pennsylvania | Luzerne | 35 | Low | Not Rated | 1914 | Recreation |
| Bear Creek Lake | Pennsylvania | Carbon | 35 | High | Fair | 1964 | Recreation |
| Patsys Lake | Pennsylvania | Fayette | 35 | High | Satisfactory | 1900 | Recreation |
| White Heron | Pennsylvania | Monroe | 34 | High | Satisfactory | 1930 | Recreation |
| Duncan Ave West Flood Control | Pennsylvania | Allegheny | 34 | Significant | Satisfactory | - | Flood Risk Reduction |
| Smith Reservoir | Pennsylvania | Erie | 34 | High | Satisfactory | 1925 | Water Supply |
| Scotts Run | Pennsylvania | Berks | 34 | High | Fair | 1953 | Recreation |
| Todd Spring Reservoir | Pennsylvania | Bedford | 34 | High | Poor | 1898 | Water Supply |
| Township Line (Airport Road) | Pennsylvania | Chester | 34 | High | Fair | 1935 | Recreation |
| Chester Co. Prison Storage Lagoon | Pennsylvania | Chester | 34 | Significant | Satisfactory | - | Other |
| Trout Run No 4 | Pennsylvania | Northumberland | 34 | High | Fair | 1882 | Water Supply |
| Penn Lake | Pennsylvania | Luzerne | 34 | High | Poor | 1905 | Recreation |
| Peach Bottom Atomic Power | Pennsylvania | York | 34 | Low | Not Rated | 1973 | Debris Control |
| Wolf Creek | Pennsylvania | Clearfield | 34 | High | Fair | 1971 | Recreation |
| Park Place No 3 | Pennsylvania | Schuylkill | 34 | High | Fair | 1909 | Water Supply |
| Twin Lakes No 2 | Pennsylvania | Westmoreland | 34 | High | Satisfactory | 1910 | Recreation |
| Mahanoy Township No 2 | Pennsylvania | Schuylkill | 34 | High | Satisfactory | 1991 | Water Supply |
| Lake Choctaw | Pennsylvania | Schuylkill | 34 | High | Poor | 1974 | Recreation |
| Lake Julia | Pennsylvania | Fayette | 34 | High | Satisfactory | 1965 | Recreation |
| Shenandoah Creek | Pennsylvania | Schuylkill | 34 | Low | Satisfactory | 1935 | Recreation |
| Lake Latonka | Pennsylvania | Mercer | 34 | High | Satisfactory | 1966 | Recreation |
| Shohola Marsh | Pennsylvania | Pike | 34 | High | Fair | 1968 | Recreation |
| Railroad Creek (Pa-615) | Pennsylvania | Bucks | 34 | High | Fair | 1977 | Flood Risk Reduction |
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.