Connogochegue

Archaic name for present-day Conococheague Creek, which enters the Potomac River near Williamsport, MD at latitude 39 36 02N longitude 77 49 42W. Conococheague, or Connogochegue, as it was known at the time, was the northernmost extent of the range along the Potomac (the southernmost extent was the "Eastern Branch", later Anacostia River) within which Congress in the Residence Bill of 1790 authorized the establishment of the Federal District, known as the District of Columbia. By presidential proclamation, George Washington placed the District at the lower end of the range.

(See United States Geological Survey reference page for Conococheague Creek.)