The merchant vessel Calumet sits hard aground in shallow water outside of the channel on St. Marys River, southeast of Sault Ste. Marie, Michigan, August 10, 2017.  (U.S. Coast Guard photo) SAULT STE. MARIE, Mich. — The U.S. Coast Guard continues to monitor a 629-foot U.S. cargo ship that ran aground on the north side of Sugar Island in the St. Marys River, Wednesday, at about 11:40 p.m. The merchant...