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
Sault Ste. Marie, Ontario Canada and the United States. Algoma Steel and the Chromium Mining and Smelting Corporation were key producers for transportation and military machines. The Huron Central Railway has been important to the operation of the steel operation, but Genesee and Wyoming, Inc., owner of the railway, has announced its intention to discontinue operations. It continued to operate under an agreement which terminated on August 15, 2010. Sault Ste. Marie prospered during the 1960s and '70s, but as imported steel began to compete with domestic production, the local industry began to contract. Since the late 1980s, Algoma has declared bankruptcy twice and