  H10835/98-99--OPR-K171-KR;  LOCATED AN OBSTRUCTION BY SIDE SCAN SONAR AND MULTIBEAM ECHOSOUNDER IN LAT. 29/15/48.62N, LONG. 094/29/31.66W (NAD83) WITH A LEAST DEPTH OF 46 FEET MLLW.  (ENTERED 9/01 BY MBH)