The St. Georges Bridge, which carries U.S. 13 over the Chesapeake & Delaware Canal, will close starting Tuesday, April 4, for approximately 18 months for major repairs. A $45.8 million contract, awarded to J.D. Eckman, Inc., involves demolishing and replacing the bridge decking, median barrier and drainage features; replacing bridge approaches and roadways; and repairing other bridge structural features. Work …