  H10890/00--OPR-K171-KR;  LOCATED AN OBSTRUCTION BY SIDE SCAN SONAR AND MULTI-BEAM ECHOSOUNDER IN LAT. 29/03/42.60N, LONG. 093/15/57.90W (NAD83) WITH A LEAST DEPTH OF 67 FEET (MLLW).    (ENTERED 12/00 BY MBH)