Email Record: Middle River and Dark Head Creek, Back River to Chesapeake Bay via Hart Island Narrows, and a cut-off channel from Gunpowder River to Chesapeake Bay via Spry Island Narrows, Md. Letter from the Secretary of War transmitting a letter from the Chief of Engineers, United States Army, dated December 11, 1939, submitting a report, together with accompanying papers and an illustration, on a preliminary examination and survey of Middle River and Dark Head Creek, Back River to Chesapeake Bay via Hart Island Narrows, and a cut-off channel from Gunpowder River to Chesapeake Bay via Spry Island Narrows, Md., authorized by the River and Harbor Act approved August 26, 1937.