 HISTORY
  CL483/00--USACE (BILL KAVANAUGH, 918-318-8328) TO CGD1 (MARY SWANSON 617-223-8356) 3/20/00;  WHILE PERFORMING A HYDROGRAPHIC SURVEY OF THE BOSTON HARBOR, BROAD SOUND, NORTH CHANNEL, AN OBSTRUCTION TO NAVIGATION WAS IDENTIFIED. DEPTHS OF 34.9