Catoctin Creek is a 27.9-mile-long (44.9 km)[1] tributary of the Potomac River in Frederick County, Maryland, US.

In Myersville, it merges with the Little Catoctin Creek at Doub's Meadow Park.

It makes a crossing with the Chesapeake and Ohio Canal at the Catoctin Aqueduct, one of just 11 of these structures to survive.

[2] Catoctin Creek enters the Potomac River east of Brunswick.

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