  H10805/98-99--OPR-K171-KR;  AN OBSTRUCTION WITH A LEAST DEPTH OF 53 FEET MLLW WAS FOUND BY SIDE SCAN SONAR AND MULTIBEAM IN LATITUDE 29/10/43.70N, LONGITUDE 094/40/32.50W (NAD83) IN GENERAL DEPTHS OF 53 FEET.  THIS OBSTRUCTION IS NOT RECOMMENDED TO BE