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
John Johnston House (Sault Ste. Marie, Michigan) John Johnston was Justice of the Peace in Sault Ste Marie for many years. He remained in Sault Ste. Marie for the rest of his life, remaining in the fur trade. In 1812, Johnston helped British troops take control of Fort Mackinac on Mackinac Island. In 1814, American forces burned his house, as well as $40,000 of his goods, in retaliation. However, Johnston rebuilt, in part by selling his parent's estate in Ireland, and became connected with John Jacob Astor's American Fur Company. John Johnston died on September 22, 1828. In 1794, John Johnston constructed a house on this site.