  H10805/98-99--OPR-K171-KR;  AN OBSTRUCTION WITH A LEAST DEPTH OF 56 FEET MLLW WAS FOUND BY SIDE SCAN SONAR IN LATITUDE 29/06/49.40N, LONGITUDE 094/38/27.10W (NAD83) IN GENERAL DEPTHS OF 58 FEET.  (ENTERED 1/00 BY MBH)