  H10741/97--OPR-G309-WH-96; AN OBSTRUCTION WAS REPORTED WITH A LEAST DEPTH OF 26 FEET IN POSITION 33 51 12.15 N, 078 03 51.92 W (NAD 83). DIVERS FOUND A BLOCK OF CONCRETE RISING ABOUT 3 FEET OFF OF THE BOTTOM. APPROXIMATE SIZE OF BLOCK IS 3 FEET BY FIVE