  H10560/94--OPR-K171-MI-94; FOUND AN UNIDENTIFIED OBSTRUCTION WITH THE APPEARANCE OF AN ABANDONED BUOY ANCHOR IN LAT. 29/40/38.12N, LONG. 093/19/41.61W (NAD83).  A DIVE INVESTIGATION WAS NOT ATTEMPTED DUE TO WEATHER AND LOW VISIBILITY.  THE LEAST DEPTH