HISTORY
  LNM 17/80--8TH CGD, 4/16/80;  A LOADED GRAIN BARGE SUNK AT MILE 150.2 ABOVE HEAD OF PASSES NEAR MID CHANNEL.  THE LEAST CLEAR DEPTH OVER THE BARGE WAS APPROX 64FT ON 16 APRIL 1980.  A MORE DETAILED SURVEY TO LOCATE THE EXACT POSITION OF THE BA