  H10804/98-99--OPR-K171-KR;  AN OBSTRUCTION WAS FOUND DURING HYDROGRAPHIC SURVEY OPERATIONS (INVOLVING SIDE SCAN SONAR AND MULTIBEAM SOUNDING) IN LAT. 29/27/42.00N, LONG. 093/41/58.00W (NAD83) WITH A SHOALEST SOUNDING OF 24 FEET (MLLW).