  H10805/98-99--OPR-K171-KR;  AN OBSTRUCTION WITH A LEAST DEPTH OF 51 FEET MLLW WAS FOUND BY SIDE SCAN SONAR IN LATITUDE 29/10/47.00N, LONGITUDE 094/38/33.40W (NAD83) IN GENERAL DEPTHS OF 53-54 FEET.  (ENTERED 1/00 BY MBH)