  ****SOURCE UNKNOWN-- CRIB WAS APPLIED BEFORE 1972 TO THE LAKE SURVEY CHART BEFORE NOS TOOK OVER THE CHART.
  L1830/76-- ADDED "DEPTH OVER CRIB 15 FT" TO SUBMERGED CRIB AT LAT. 41/41/58.9N, LONG. 87/30/19.67W. (ENTERED 4/05 CEH)
F00502/06-- OPR-Y387-N