  ****SOURCE UNKNOWN-- PWI WITH DEPTH OVER CRIB 27 FEET IN POSITION OF LAT. 41/39/45.4N, LONG. 87/24/17.33W WAS APPLIED BEFORE 1972 TO THE LAKE SURVEY CHART BEFORE NOS TOOK OVER THE CHART. (ENTERED 4/05 CEH)
  F00502/06-- OPR-Y387-NRT4-05; Item was foun