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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
C.W. Bill Young Lock and Dam Pennsylvania Allegheny 36 Significant Not Available 1934 Navigation
Lower Pennsylvania Fayette 36 High Poor 1906 Recreation
Beaver Creek (Pa-433) Pennsylvania Chester 36 High Satisfactory 1975 Flood Risk Reduction
Jeannette (Mountain Valley Lake) Pennsylvania Westmoreland 36 Significant Fair 1889 Recreation
Canonsburg No 2 Pennsylvania Washington 36 High Poor 1932 Recreation
Minersville No 4 Pennsylvania Schuylkill 36 High Poor 1912 Water Supply
Whetstone No 2 Storage Pennsylvania Elk 36 High Satisfactory 1962 Water Supply
Pickering Creek Pennsylvania Chester 36 High Fair 1928 Water Supply
Sweet Arrow Lake Pennsylvania Schuylkill 36 High Satisfactory 1923 Recreation
Kintz Creek (Pa-439) Pennsylvania Pike 36 High Poor 1970 Flood Risk Reduction
Hawk Mountain Pennsylvania Schuylkill 35 High Fair 1978 Recreation
Patsys Lake Pennsylvania Fayette 35 High Satisfactory 1900 Recreation
Canoe Creek Pennsylvania Blair 35 High Fair 1971 Recreation
Andy Pennsylvania Washington 35 Low Satisfactory — Recreation
Conemaugh Township Impounding Pennsylvania Somerset 35 Low Not Rated 1961 Recreation
Bear Creek Lake Pennsylvania Carbon 35 High Fair 1964 Recreation
Muddy Run Intake Channel Dam Pennsylvania Lancaster 35 High Fair 1967 Hydroelectric
Maple Lake Pennsylvania Pike 35 High Fair 1972 Recreation
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
Area 3/4 Lower Sed Pond Pennsylvania Greene 35 Low Satisfactory 2004 Other
David Mine Sedimentation Pond No 2 Pennsylvania Armstrong 35 High Fair 1989 Other
Carbaugh Run Pennsylvania Adams 35 High Poor 1960 Water Supply
Mill Creek Intake Pennsylvania Luzerne 35 Low Not Rated 1914 Recreation
No 5 Pennsylvania Lackawanna 35 High Poor 1888 Grade Stabilization
Ligonier Reservoir Pennsylvania Westmoreland 35 High Fair 1954 Water Supply
Wisecarver Pennsylvania Greene 35 High Satisfactory 1931 Water Supply
Ridgebury Lake Pennsylvania Bradford 35 High Fair 1973 Recreation
Hosensock (Pa-424) Pennsylvania Schuylkill 35 High Fair 1960 Flood Risk Reduction
Township Line (Airport Road) Pennsylvania Chester 34 High Fair 1935 Recreation
Scotts Run Pennsylvania Berks 34 High Fair 1953 Recreation
Chester Co. Prison Storage Lagoon Pennsylvania Chester 34 Significant Satisfactory — Other
Virgin Run Pennsylvania Fayette 34 Significant Poor 1953 Recreation
Lake Julia Pennsylvania Fayette 34 High Satisfactory 1965 Recreation
Lake Latonka Pennsylvania Mercer 34 High Satisfactory 1966 Recreation
Duncan Ave West Flood Control Pennsylvania Allegheny 34 Significant Satisfactory — Flood Risk Reduction
Todd Spring Reservoir Pennsylvania Bedford 34 High Poor 1898 Water Supply
Trout Run No 4 Pennsylvania Northumberland 34 High Fair 1882 Water Supply
Park Place No 3 Pennsylvania Schuylkill 34 High Fair 1909 Water Supply
Railroad Creek (Pa-615) Pennsylvania Bucks 34 High Fair 1977 Flood Risk Reduction
Lake Choctaw Pennsylvania Schuylkill 34 High Poor 1974 Recreation
Twin Lakes No 2 Pennsylvania Westmoreland 34 High Satisfactory 1910 Recreation
White Heron Pennsylvania Monroe 34 High Satisfactory 1930 Recreation
Penn Lake Pennsylvania Luzerne 34 High Poor 1905 Recreation
Shohola Marsh Pennsylvania Pike 34 High Fair 1968 Recreation
Peach Bottom Atomic Power Pennsylvania York 34 Low Not Rated 1973 Debris Control
Smith Reservoir Pennsylvania Erie 34 High Satisfactory 1925 Water Supply
Mahanoy Township No 2 Pennsylvania Schuylkill 34 High Satisfactory 1991 Water Supply
Shenandoah Creek Pennsylvania Schuylkill 34 Low Satisfactory 1935 Recreation

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.