The Cobb Point Bar Light (also called Cobb Island Bar Light) was a screw-pile lighthouse

Screw-pile lighthouse

A screw-pile lighthouse is a lighthouse which stands on piles that are screwed into sandy or muddy sea or river bottoms. The first screw-pile lighthouse was built by blind Irish engineer Alexander Mitchell...

 located in the Potomac River

Potomac River

The Potomac River flows into the Chesapeake Bay, located along the mid-Atlantic coast of the United States. The river is approximately long, with a drainage area of about 14,700 square miles...

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History

A light at Cobb Point was first requested in 1875 to mark the entrance to the tricky channel leading into the Wicomico River (not to be confused with the river of the same name on the Eastern Shore). After two additional requests, funds were finally appropriated in 1887. Construction was delayed, however, and the light was not commissioned until Christmas 1889.

A fire in 1939 caused by light keeper Matthew Wicke, resulted in heavy damage, and in the following year the house was torn down, replaced by a beacon set on the same foundation.