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 |
|---|---|---|---|---|---|---|---|
| Merriman | Pennsylvania | Butler | 40 | High | Fair | 1966 | Recreation |
| Griffin | Pennsylvania | Lackawanna | 40 | High | Poor | 1888 | Water Supply |
| Midfield Sedimentation Pond | Pennsylvania | Allegheny | 40 | High | Satisfactory | 1988 | Flood Risk Reduction |
| Montour Ash Basin No 1 | Pennsylvania | Montour | 40 | High | Satisfactory | 1971 | Other |
| Indian Creek | Pennsylvania | Fayette | 40 | High | Poor | 1905 | Water Supply |
| Brunner Island Ash Basin No 6 | Pennsylvania | York | 39 | Significant | Satisfactory | 1979 | Other |
| Williams | Pennsylvania | Adams | 39 | Significant | Unsatisfactory | 1981 | Irrigation |
| Sausman Tailings | Pennsylvania | Huntingdon | 39 | Significant | Not Rated | — | Tailings |
| Maple Creek Silt Pond A | Pennsylvania | Washington | 39 | High | Satisfactory | 1977 | Other |
| Briar Creek Lake Pa-497 | Pennsylvania | Columbia | 39 | High | Fair | 1968 | Recreation |
| Stony Run | Pennsylvania | Union | 39 | Significant | Not Rated | — | Water Supply |
| Bailey Sediment Pond No 2 | Pennsylvania | Greene | 39 | High | Satisfactory | — | Other |
| Mount Laurel (Mud Run) | Pennsylvania | Schuylkill | 39 | High | Satisfactory | 1879 | Water Supply |
| Fishpond | Pennsylvania | Columbia | 39 | Low | Not Rated | 1975 | Recreation |
| Pegs Run Slurry Impoundment | Pennsylvania | Greene | 39 | Low | Fair | 1983 | Other |
| Indian Lake | Pennsylvania | Susquehanna | 39 | High | Fair | 1916 | Recreation |
| Harmar Storage Pond No 4 | Pennsylvania | Allegheny | 39 | Low | Satisfactory | 1980 | Other |
| Burnt Cabin Dunlap Creek (Pa-471) | Pennsylvania | Fayette | 39 | High | Satisfactory | 1967 | Flood Risk Reduction |
| Glade Spring | Pennsylvania | Bedford | 39 | Significant | Not Rated | 1973 | Recreation |
| Towamensing Trails | Pennsylvania | Carbon | 38 | High | Fair | 1977 | Recreation |
| Colyer Lake | Pennsylvania | Centre | 38 | High | Fair | 1966 | Recreation |
| Pa-482 | Pennsylvania | Washington | 38 | High | Satisfactory | 1970 | Flood Risk Reduction |
| Crystal Run Reservoir | Pennsylvania | Schuylkill | 38 | High | Fair | 1898 | Water Supply |
| Lake Oneida | Pennsylvania | Butler | 38 | High | Satisfactory | 1918 | Water Supply |
| Comet Lake | Pennsylvania | Franklin | 38 | Significant | Fair | 1962 | Recreation |
| Evans City Waterworks No 1 | Pennsylvania | Butler | 38 | High | Fair | 1954 | Water Supply |
| Sheppard Myers | Pennsylvania | York | 38 | High | Poor | 1933 | Water Supply |
| Emerald Lake | Pennsylvania | Washington | 38 | Significant | Satisfactory | 1912 | Recreation |
| Opossum Lake | Pennsylvania | Cumberland | 38 | High | Satisfactory | 1961 | Recreation |
| Lanpher | Pennsylvania | Allegheny | 38 | High | Satisfactory | 1915 | Water Supply |
| Northmoreland Lake (Pa-117) | Pennsylvania | Westmoreland | 38 | High | Satisfactory | 1989 | Recreation |
| Silver Creek Reservoir | Pennsylvania | Schuylkill | 38 | High | Satisfactory | 1850 | Water Supply |
| Olyphant No 3 | Pennsylvania | Lackawanna | 38 | Significant | Fair | 1898 | Recreation |
| Marshall Reservoir No. 2 | Pennsylvania | Washington | 37 | Significant | Satisfactory | 1928 | Recreation |
| Elder | Pennsylvania | Bedford | 37 | Low | Not Rated | — | Recreation |
| Galion Bay | Pennsylvania | Clearfield | 37 | High | Fair | 1971 | Recreation |
| Raven Run No 2 | Pennsylvania | Schuylkill | 37 | High | Fair | 1885 | Water Supply |
| H B Norton | Pennsylvania | Elk | 37 | High | Satisfactory | 1932 | Water Supply |
| Longford Lake | Pennsylvania | Susquehanna | 37 | High | Satisfactory | 1974 | Recreation |
| Sludge Bed No 5 | Pennsylvania | Butler | 37 | High | Fair | 1983 | Other |
| Memorial Lake | Pennsylvania | Lebanon | 37 | High | Poor | 1946 | Recreation |
| Griffin (Pa-455) | Pennsylvania | Tioga | 37 | High | Satisfactory | 1963 | Flood Risk Reduction |
| Laurel Run No 2 | Pennsylvania | Luzerne | 37 | High | Poor | 1885 | Recreation |
| Huntingdon Smithfield Lily Creek | Pennsylvania | Huntingdon | 37 | High | Satisfactory | 1967 | Flood Risk Reduction |
| Bailey Mine Area No. 3 Saddle C | Pennsylvania | Greene | 37 | High | Satisfactory | 2014 | Other |
| Whetstone No 2 Storage | Pennsylvania | Elk | 36 | High | Satisfactory | 1962 | Water Supply |
| Sweet Arrow Lake | Pennsylvania | Schuylkill | 36 | High | Satisfactory | 1923 | Recreation |
| Lower | Pennsylvania | Fayette | 36 | High | Poor | 1906 | Recreation |
| Union City Reservoir | Pennsylvania | Erie | 36 | High | Poor | 1935 | Water Supply |
| Beaver Creek (Pa-433) | Pennsylvania | Chester | 36 | High | Satisfactory | 1975 | 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.