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 |
|---|---|---|---|---|---|---|---|
| Mauch Chunk Lake (Pa-462) | Pennsylvania | Carbon | 55 | High | Fair | 1971 | Flood Risk Reduction |
| Holtwood | Pennsylvania | Lancaster | 55 | Low | Satisfactory | 1910 | Hydroelectric |
| Allegheny River Lock and Dam 9 | Pennsylvania | Armstrong | 55 | Low | Not Available | 1938 | Navigation |
| Olyphant No 2 | Pennsylvania | Lackawanna | 55 | Significant | Fair | 1888 | Recreation |
| Neifert Creek (Pa-422a) | Pennsylvania | Schuylkill | 55 | High | Satisfactory | 1968 | Flood Risk Reduction |
| Upper Tumbling Run | Pennsylvania | Schuylkill | 55 | High | Poor | 1836 | Water Supply |
| Boyertown Reservoir | Pennsylvania | Berks | 55 | High | Satisfactory | 1929 | Water Supply |
| Moraine State Park | Pennsylvania | Butler | 55 | High | Satisfactory | 1968 | Recreation |
| Bailey No 1 South Saddle Dike | Pennsylvania | Greene | 55 | Low | Satisfactory | 2004 | Other |
| Beaverdam Run | Pennsylvania | Cambria | 55 | High | Fair | 1975 | Water Supply |
| Montour Heights Country Club | Pennsylvania | Allegheny | 54 | Significant | Satisfactory | 1987 | Recreation |
| Kettle | Pennsylvania | Blair | 54 | High | Fair | 1888 | Water Supply |
| Williams Bridge Reservoir | Pennsylvania | Lackawanna | 54 | High | Fair | 1893 | Water Supply |
| Lake Chillisquaque | Pennsylvania | Montour | 54 | High | Fair | 1971 | Other |
| Rockview Reservoir | Pennsylvania | Centre | 53 | High | Poor | - | Water Supply |
| Lake Heritage | Pennsylvania | Adams | 53 | High | Poor | 1966 | Recreation |
| Ironworks | Pennsylvania | Bucks | 53 | High | Fair | 1943 | Water Supply |
| Bailey No. 8 Sediment Pond | Pennsylvania | Greene | 53 | High | Satisfactory | - | Other |
| Clarence F. Walker Lake (Pa-637) | Pennsylvania | Snyder | 53 | High | Fair | 1970 | Recreation |
| Lyman Run | Pennsylvania | Potter | 53 | High | Satisfactory | 2007 | Recreation |
| Hamburg Reservoir | Pennsylvania | Berks | 53 | High | Fair | 1963 | Water Supply |
| Boyd Keller Reservoir | Pennsylvania | Clinton | 53 | High | Poor | 1956 | Water Supply |
| Martins Creek (Pa-467) | Pennsylvania | Susquehanna | 52 | High | Fair | 1967 | Flood Risk Reduction |
| Greenlick Run (Pa-656) | Pennsylvania | Fayette | 52 | High | Satisfactory | 1973 | Flood Risk Reduction |
| Lake Nessmuk (Pa-601) | Pennsylvania | Tioga | 52 | High | Satisfactory | 1968 | Recreation |
| Little Buffalo Creek | Pennsylvania | Perry | 52 | High | Fair | 1970 | Recreation |
| Hamburg Flood Control (Pa-477) | Pennsylvania | Berks | 52 | High | Fair | 1965 | Flood Risk Reduction |
| Colver | Pennsylvania | Cambria | 52 | High | Fair | 1994 | Water Supply |
| Lake Redman | Pennsylvania | York | 52 | High | Poor | 1967 | Water Supply |
| Point Marion Lock and Dam | Pennsylvania | Greene | 52 | Significant | Not Available | 1959 | Navigation |
| Lake Ontelaunee | Pennsylvania | Berks | 52 | High | Fair | 1935 | Water Supply |
| Pa-481 | Pennsylvania | Washington | 51 | High | Satisfactory | 1984 | Flood Risk Reduction |
| Plane Nine | Pennsylvania | Blair | 51 | High | Fair | 1907 | Water Supply |
| Whitetail Land CO - A | Pennsylvania | Franklin | 51 | High | Fair | 1993 | Water Supply |
| Frances Slocum | Pennsylvania | Luzerne | 51 | High | Fair | 1965 | Recreation |
| Auburn | Pennsylvania | Schuylkill | 51 | High | Fair | 1950 | Recreation |
| Lake Mount Union | Pennsylvania | Huntingdon | 51 | High | Satisfactory | 1927 | Water Supply |
| Nesquehoning 4th Hollow Reservoir | Pennsylvania | Carbon | 51 | High | Fair | 1975 | Water Supply |
| Hadley (Pa-489) | Pennsylvania | Mercer | 51 | High | Fair | 1968 | Flood Risk Reduction |
| Tyrone Reservoir #2 | Pennsylvania | Blair | 51 | High | Fair | 1912 | Water Supply |
| Lake Susquehanna | Pennsylvania | Luzerne | 51 | High | Poor | 1973 | Recreation |
| Osborne Lagoon | Pennsylvania | Chester | 50 | Significant | Satisfactory | 2012 | Other |
| Pymatuning | Pennsylvania | Crawford | 50 | High | Fair | 1933 | Flood Risk Reduction |
| Lake Wilhelm (Pa-475) | Pennsylvania | Mercer | 50 | High | Satisfactory | 1969 | Flood Risk Reduction |
| Queen Lane Raw Water Basin | Pennsylvania | Philadelphia | 50 | High | Fair | 1900 | Water Supply |
| Ringtown Reservoir No 6 | Pennsylvania | Schuylkill | 50 | High | Fair | 1921 | Water Supply |
| Cross Creek (Pa-662) | Pennsylvania | Washington | 50 | High | Satisfactory | 1983 | Flood Risk Reduction |
| Leonard George | Pennsylvania | Greene | 50 | Low | Satisfactory | 2001 | Recreation |
| Freshwater Impoundment | Pennsylvania | Indiana | 50 | High | Fair | 1974 | Water Supply |
| Mitchell Sludge Sedimentation Pond | Pennsylvania | Washington | 50 | Significant | Satisfactory | 1982 | Other |
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.