WHARTON, N.J. – A massive 15-by-15-foot sinkhole opened up in the median of Interstate 80 near Wharton, New Jersey, on Wednesday. New Jersey's Department of Transportation has closed the westbound lanes around the sinkhole out of an abundance of caution. The eastbound side of I-80 in that area was already shut down because of road stability repairs that are underway. Sinkholes opened up on that side of the road back in December. Sinkholes tend to appear after extended periods of rain. However, according to the U.S. Drought Monitor, moderate drought conditions are present across the state. WHY SINKHOLES TEND TO APPEAR AFTER EXTREME RAIN FOX 5 New York reports old mine tunnels are present under areas where the sinkholes keep opening. MOMENT MASSIVE SINKHOLE OPENS ON SOCCER FIELD CAPTURED ON SURVEILLANCE VIDEO The eastbound lanes of I-80 near Wharton are not expected to reopen for another two months.