AN UNINTENTIONAL ROOF FALL OCCURRED IN THE 4-WAY INTERSECTION OF ENTRY #5 AT 9 + 80 WEST OFF OF 6TH NORTH. THE FALL 30'WIDE, 17'LONG, & 6'THICK DID NOT IMPAIR VENTILATION OR IMPEDE TRAVEL. DAM AGE OCCURRED TO THE BELT STRUCTURE OF THIS LOCATION. THE ROOF WAS SUPPORTED WITH 4' GLUE BOLTS & 6'SOUBLE LOCKING BOLTS. THE INTERSECTION WAS DEVELOPED JUNE 2001.