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 Airport not affiliated with a municipality, since the city of Sault Ste. Marie declined to assume control. In 2002, the SSMADC opened "Runway Park", an entertainment and recreation area, on unused airport property to help generate revenue to support the airport's operation. The Sault Ste. Marie airport has equipment to support instrument approaches for all-weather operation, and a Nav Canada control tower. Air Canada Express operated by Jazz Air flies to Toronto Pearson International Airport six times daily using Bombardier Dash 8-100 aircraft. Porter Airlines operates four daily roundtrip flights to Toronto Billy Bishop airport during weekdays and two daily flights