A ROOF FALL OCCURRED AT THE INTERSECTION OF 123 AND 36N (J EAST PANEL); THE FALLEN PORTION APPEARED TO BE APPROX. 19' DEEP, 55' LONG, 45' WIDE AND DOME-LIKE. ROOF FALL WAS NOT WITNESSED AND N O INJURIES OR EQUIPMENT DAMAGE RESULTED. EXACT TIME AND DATE OF FALL IS UNKNOWN; IT IS ESTIMATED TO HAVE FALLEN SOMETIME BETWEEN 7/24/00 AND 7/28/00.