At approx. 12:10 am on 1/5/2014 a roof fall above the anchorage was found in the F (intake) entry of the 6Left off 4North section. The roof fall was at survey spad #21+10 and extended inby to about 21+50. The fall was about 40ft. long 17ft. wide and 6.5ft. high. All areas were dangered off around it and the escapeway was rerouted. There were no injuries or property damage.