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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
Merriman Pennsylvania Butler 40 High Fair 1966 Recreation
New Holland Reservoir Pennsylvania Lancaster 40 High Fair 1953 Water Supply
Midfield Sedimentation Pond Pennsylvania Allegheny 40 High Satisfactory 1988 Flood Risk Reduction
Tafton Dike Pennsylvania Pike 40 High Satisfactory 1926 Hydroelectric
Saul Run (Pa-458) Pennsylvania Mercer 40 High Satisfactory 1963 Flood Risk Reduction
Burnt Cabin Dunlap Creek (Pa-471) Pennsylvania Fayette 39 High Satisfactory 1967 Flood Risk Reduction
Williams Pennsylvania Adams 39 Significant Unsatisfactory 1981 Irrigation
Maple Creek Silt Pond A Pennsylvania Washington 39 High Satisfactory 1977 Other
Bailey Sediment Pond No 2 Pennsylvania Greene 39 High Satisfactory — Other
Stony Run Pennsylvania Union 39 Significant Not Rated — Water Supply
Glade Spring Pennsylvania Bedford 39 Significant Not Rated 1973 Recreation
Fishpond Pennsylvania Columbia 39 Low Not Rated 1975 Recreation
Sausman Tailings Pennsylvania Huntingdon 39 Significant Not Rated — Tailings
Mount Laurel (Mud Run) Pennsylvania Schuylkill 39 High Satisfactory 1879 Water Supply
Briar Creek Lake Pa-497 Pennsylvania Columbia 39 High Fair 1968 Recreation
Pegs Run Slurry Impoundment Pennsylvania Greene 39 Low Fair 1983 Other
Indian Lake Pennsylvania Susquehanna 39 High Fair 1916 Recreation
Brunner Island Ash Basin No 6 Pennsylvania York 39 Significant Satisfactory 1979 Other
Harmar Storage Pond No 4 Pennsylvania Allegheny 39 Low Satisfactory 1980 Other
Silver Creek Reservoir Pennsylvania Schuylkill 38 High Satisfactory 1850 Water Supply
Towamensing Trails Pennsylvania Carbon 38 High Fair 1977 Recreation
Sheppard Myers Pennsylvania York 38 High Poor 1933 Water Supply
Colyer Lake Pennsylvania Centre 38 High Fair 1966 Recreation
Emerald Lake Pennsylvania Washington 38 Significant Satisfactory 1912 Recreation
Evans City Waterworks No 1 Pennsylvania Butler 38 High Fair 1954 Water Supply
Comet Lake Pennsylvania Franklin 38 Significant Fair 1962 Recreation
Lake Oneida Pennsylvania Butler 38 High Satisfactory 1918 Water Supply
Pa-482 Pennsylvania Washington 38 High Satisfactory 1970 Flood Risk Reduction
Northmoreland Lake (Pa-117) Pennsylvania Westmoreland 38 High Satisfactory 1989 Recreation
Olyphant No 3 Pennsylvania Lackawanna 38 Significant Fair 1898 Recreation
Crystal Run Reservoir Pennsylvania Schuylkill 38 High Fair 1898 Water Supply
Opossum Lake Pennsylvania Cumberland 38 High Satisfactory 1961 Recreation
Lanpher Pennsylvania Allegheny 38 High Satisfactory 1915 Water Supply
Bailey Mine Area No. 3 Saddle C Pennsylvania Greene 37 High Satisfactory 2014 Other
Memorial Lake Pennsylvania Lebanon 37 High Poor 1946 Recreation
Sludge Bed No 5 Pennsylvania Butler 37 High Fair 1983 Other
Huntingdon Smithfield Lily Creek Pennsylvania Huntingdon 37 High Satisfactory 1967 Flood Risk Reduction
Raven Run No 2 Pennsylvania Schuylkill 37 High Fair 1885 Water Supply
Griffin (Pa-455) Pennsylvania Tioga 37 High Satisfactory 1963 Flood Risk Reduction
Elder Pennsylvania Bedford 37 Low Not Rated — Recreation
Laurel Run No 2 Pennsylvania Luzerne 37 High Poor 1885 Recreation
H B Norton Pennsylvania Elk 37 High Satisfactory 1932 Water Supply
Longford Lake Pennsylvania Susquehanna 37 High Satisfactory 1974 Recreation
Galion Bay Pennsylvania Clearfield 37 High Fair 1971 Recreation
Marshall Reservoir No. 2 Pennsylvania Washington 37 Significant Satisfactory 1928 Recreation
Jeannette (Mountain Valley Lake) Pennsylvania Westmoreland 36 Significant Fair 1889 Recreation
Pond No 2 Pennsylvania Chester 36 Low Poor — Tailings
Sweet Arrow Lake Pennsylvania Schuylkill 36 High Satisfactory 1923 Recreation
Lower Pennsylvania Fayette 36 High Poor 1906 Recreation
Kintz Creek (Pa-439) Pennsylvania Pike 36 High Poor 1970 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.