 HISTORY
  NM48/63(6120)--BUOY EST. AT OBSTR. COVERED 30 FT.
  CL738/64--COE; DIVER INVESTIGATION SHOWS LARGE ROCKS (BOULDERS, LEDGE), 35 FT LD.
  CL117/65--OBSTR. REMOVED TO 42 FT LD.
  H9088/69--OPR-474, SP-AMC-11-68; ROCK DOES EXIST BUT ATTEMPTS A