ITEM SOURCE UNKNOWN.  FIRST APPEARED ON CHART BETWEEN 1986 AND 1993.  SURDEX DOES NOT SHOW ANY SURVEYS IN THIS AREA.  ITEM MAY HAVE COME FROM USACE SURVEY.
  F00500--  OPR-Z486-NRB-04, JULY 2004;  200% SSS WAS RUN OVER THE CHARTED OBSTRUCTION.  NEST STA