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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
Hagerstown Municipal Pwr Plant Dam Maryland Washington 10 Low Fair 1950 Water Supply
Higgins Millpond Maryland Dorchester 9 Low — 1801 Recreation
Richard Smith Dam Maryland Kent 9 Low Fair 1970 Recreation
Big Millpond Dam Maryland Worcester 9 Low Fair 1900 Recreation
Carpenter Farm Pond Maryland Kent 9 Low Fair 1968 Fish and Wildlife Pond
Mitchell Pond #1 (Nanticoke Road) Maryland Wicomico 9 Significant Fair 1937 Recreation
Galestown Millpond (Galestown-Reliance Road) Maryland Dorchester 9 Low — 1972 Recreation
Shipleys Crossing North Dam 1 (Galiot Dr) Maryland Anne Arundel 9 Significant Satisfactory 2008 Flood Risk Reduction
Powellville Dam Maryland Wicomico 9 Low Fair 1940 Water Supply
Diversified Lane Pond Dam Maryland Howard 8 Significant Satisfactory 1992 Flood Risk Reduction
Hancock Sewage Lagoon Maryland Washington 8 Low Satisfactory 1963 Other
Allen Town Pond (Allen Road) Maryland Somerset 8 Low Fair 1700 Recreation
Piedmont Water Supply Intake Dam Maryland Garrett 8 Low Not Rated 1911 Water Supply
Upper Potomac Industrial Park Levee Maryland Allegany 8 High Fair 2005 Flood Risk Reduction
Great Falls Dam, Lock No. 20 Maryland Montgomery 8 Low — 1850 Navigation
Boxers Rest Farm Pond Maryland Queen Anne's 8 Low Satisfactory 1975 Irrigation
Lake Kittamaqundi Maryland Howard 7 Low Satisfactory 1967 Recreation
Foreman Branch Dam Maryland Queen Anne's 7 Low Fair 1955 Irrigation
Newpage Westvaco Dam Maryland Allegany 7 Low Fair 1913 Water Supply
Glenmar Pond 2 Dam Maryland Howard 3 Significant Satisfactory 1984 Flood Risk Reduction
Aspen Lake Maryland Carroll 0 Significant Unsatisfactory —
Millersville Post Office Dam Maryland Anne Arundel 0 Significant — — Recreation
Quaker Mill Flood Control Dam Maryland Howard 0 Significant — —
Guilford Road Dam Maryland Howard 0 Significant Poor — Flood Risk Reduction
Gerwig Lane Swm Maryland Howard 0 High Satisfactory 1980 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.