St. Marys River (Michigan–Ontario) St. Marys River (Michigan–Ontario) The St. Marys River (), sometimes written as the St. Mary's River, drains Lake Superior, starting at the end of Whitefish Bay and flowing southeast into Lake Huron, with a fall of . For its entire length it is an international border, separating Michigan in the United States from Ontario, Canada. The twin cities of Sault Ste. Marie, Ontario, and Sault Ste. Marie, Michigan are connected across the St. Marys River by the Sault Ste. Marie International Bridge. The St. Marys Rapids are just below the river's exit from Lake Superior and can be bypassed by
Old Federal Building (Sault Ste. Marie) Old Federal Building (Sault Ste. Marie) The United States Post Office (also known as the Old Federal Building) at 209 East Portage Avenue in Sault Ste. Marie, Michigan, is an historic building which has served various purposes since its construction in the early 20th century. The building was listed on the National Register of Historic Places on September 9, 1977. In 1822, Fort Brady was constructed on this site. In 1893, Federal troops abandoned the fort in favor of new location closer to the center of the Soo canal. The old fort site was reserved for the construction of a