Beaver Dam (Maryland)

Beaver Dam is a flooded marble quarry in Cockeysville, Maryland that has been used as a swimming location since the 1930s.

[1] The quarry began operation in the 19th century and much of the labor was that of Irish immigrants using hand drills, hammers and chisels.

In 1878, Hugh Sisson acquired the property and began using the latest equipment available: steam powered derricks, shovels, and diamond bit drills.

Stone was loaded onto wagons and pulled by oxen to the nearby Northern Central Railway in Cockeysville until the quarry site itself was connected to the rail in 1866.

The dolomitic marble, known to geologists as the Cockeysville Marble, from the quarry was used widely within the eastern United States, including the Washington Monument in Baltimore and the one in Washington, D.C.[2][3]