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Seneca Creek

Maryland Tributary

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Seneca Creek is a 5.8 mile stream entirely in Montgomery County, Maryland. It includes two main tributaries, Great Seneca Creek (21.5 miles long) and Little Seneca Creek (14 miles long). The two tribtaries merge near Darnestown, then flow to the Potomac under Seneca Aqueduct on the C&O Canal and into the Potomac River. There are several popular spots along the creek for fishing and boating. Near the Aqueduct is the ruins of the Seneca Quarry, which provided sandstone for the Smithsonian Castle and other buildings in Washington, D.C.

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Contact Information
Maryland Department of Natural Resources