  H10805/98-99--OPR-K171-KR;  AN OBSTRUCTION WITH A LEAST DEPTH OF 57 FEET MLLW WAS FOUND BY SIDE SCAN SONAR AND MULTIBEAM IN LATITUDE 29/06/49.22N, LONGITUDE 094/38/21.52W (NAD83) IN GENERAL DEPTHS OF 58 FEET.  THIS ITEM WAS NOT RESOLVED BY THE HYDROGRA