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Browse Dams

425 dams in the National Inventory of Dams.

National Inventory of Dams

Browse 425 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
Jennings Randolph Dam Maryland Mineral 296 High Not Available 1981 Flood Risk Reduction
Savage River Dam Maryland Garrett 184 High Satisfactory 1952 Flood Risk Reduction
Liberty Dam Maryland Baltimore 175 High Unsatisfactory 1953 Water Supply
Prettyboy Dam Maryland Baltimore 155 High Fair 1936 Water Supply
T. Howard Duckett Dam Maryland Howard 139 High Fair 1953 Water Supply
Loch Raven Dam Maryland Baltimore 130 High Satisfactory 1923 Water Supply
Druid Hill Lake Reservoir and Storage Tanks Maryland Baltimore City 118 High Poor 1871 Water Supply
Little Seneca Dam Maryland Montgomery 99 High Fair 1984 Water Supply
Rocky Gap Dam Maryland Allegany 98 High Poor 1969 Water Supply
Conowingo Maryland Cecil 94 High Satisfactory 1928 Hydroelectric
Deep Creek Dam Maryland Garrett 85 High Fair 1925 Hydroelectric
Brighton Maryland Montgomery 82 High Satisfactory 1943 Hydroelectric
Hunting Creek Dam Maryland Frederick 79 High Fair 1969 Water Supply
Lake Frank Maryland Montgomery 78 High Fair 1967 Recreation
Cove Point Lng Main Dam Maryland Calvert 78 Significant Fair 1974 Recreation
Piney Run Dam Maryland Carroll 73 High Unsatisfactory 1974 Water Supply
York Bldg Products Settling Pond 12 Maryland Cecil 70 Significant Satisfactory 2004 Tailings
Mason-Dixon Water Supply Pond Maryland Cecil 67 Low Satisfactory 1966 Other
Prince Frederick Wwtp Pond 2 Maryland Calvert 65 Low — 2002 Other
Lake Needwood Maryland Montgomery 65 High Fair 1965 Recreation
Warner Gap Hollow Dam Maryland Washington 65 High Unsatisfactory 1902 Water Supply
Seneca State Park Dam (Seneca Creek Road) Maryland Montgomery 64 High Poor 1975 Recreation
Greenbrier State Park Dam & Dike Maryland Washington 64 High Unsatisfactory 1965 Recreation
Lake Linganore Maryland Frederick 63 High Unsatisfactory 1972 Recreation
Mt. Soma Reservoir Maryland Harford 61 High Satisfactory 2018 Water Supply
Little Youghiogheny Site 6 (Broadford) Maryland Garrett 60 High Fair 1971 Water Supply
Pecks Branch Dam (Ashburton) Maryland Baltimore City 59 High Satisfactory 1956 Other
Atkisson Reservoir Maryland Harford 59 High Unsatisfactory 1942 Water Supply
Fishing Creek Dam Maryland Frederick 58 High Unsatisfactory 1925 Water Supply
Mason Dixon Original Settling Pond Maryland Cecil 52 Low Satisfactory 1966 Tailings
York Bldg Products Settling Pond 11 Maryland Cecil 51 Significant Fair 1999 Tailings
Lake Marian (Woodridge Road) Maryland Frederick 50 Low Satisfactory 1973 Recreation
Don Pleasants Dam Maryland Allegany 50 Significant Satisfactory 1977 Recreation
Beechtree Dam Maryland Prince George's 50 Low Fair 2002 Irrigation
Cecil Sand and Gravel Pond 6 Maryland Cecil 49 Significant Fair 2006 Tailings
York Bldg Products Settling Pond 10 Maryland Cecil 48 Significant Fair 1991 Tailings
Jennifer Road Swm Route 50 and Route 2 (Sha Bmp 020259) Maryland Anne Arundel 47 Significant — 1985 Flood Risk Reduction
Frostburg Reservoir Maryland Garrett 46 High Poor 1990 Water Supply
Montebello Waste Water Lake Maryland Baltimore City 46 Low — 1915 Other
Chesapeake Ranch Estates Dam (Chisolm Trail) Maryland Calvert 46 High Fair 1965 Recreation
York Bldg Products Settling Pond 13 Maryland Cecil 45 Significant Satisfactory 2016 Tailings
Breton Bay Golf and Country Club Dam Maryland St. Mary's 45 Significant Unsatisfactory 1970 Irrigation
Little Deer Creek Site 3 Maryland Harford 45 Significant Fair 1962 Flood Risk Reduction
Little Deer Creek Site 1 Maryland Harford 45 Significant Fair 1958 Recreation
Little Youghiogheny Site 5 Maryland Garrett 45 High Fair 1968 Flood Risk Reduction
Little Youghiogheny Site 7 Maryland Garrett 45 High Fair 1960 Flood Risk Reduction
New Bald Eagle Road Swm Maryland Prince George's 44 High Poor 2006 Flood Risk Reduction
Lake Merle Dam Maryland Frederick 44 Significant Satisfactory 1971 Recreation
Little Deer Creek Site 2a (Mcknight/Rutledge) Maryland Harford 44 Significant Fair 1962 Flood Risk Reduction
York Building Products Pond No. 5 Maryland Cecil 44 Low Satisfactory 1971 Tailings

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.