PHILADELPHIA - Officials on Thursday were hoping tugboats could haul away a barge that broke loose during Tropical Storm Isaias and lodged itself under a bridge.The Vine Street Expressway Bridge remained closed to Interstate 676 traffic in both directions, forcing drivers to find alternate routes in the city.The Army Corps of Engineers was using the barge to dredge the Schuylkill River above the Fairmount Dam, when it came loose in the rain-swollen river during Isaias on Tuesday.They had targeted early Thursday afternoon as a potential time to relocate the barge using the tugboats, but an official time frame for a move has yet to be announced.