Mill Creek is a 14.5-mile-long (23.3 km)[1] tributary of Opequon Creek, belonging to the Potomac River and Chesapeake Bay watersheds, located in Berkeley County in West Virginia's Eastern Panhandle.[2] Its name reflects its past as a popular site for various types of mills, beginning with one constructed by Morgan Morgan in the mid-18th century near his cabin in present-day Bunker Hill.