PITTSBURGH — The U.S. Coast Guard is scheduled to establish a safety zone on the Allegheny River, Friday, in preparation for the First Night Pittsburgh. The safety zone will extend the entire width of the river from mile marker 0.6, near the Roberto Clemente Bridge, to mile marker 0.8, near the Rachel Carson Bridge, from 5:30 p.m., until 6:45 p.m. Mariners shall not enter into, depart from, or move...