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 Municipal Airport feet (218 m) above mean sea level. It has one runway designated 14/32 with an asphalt surface measuring 5,234 by 100 feet (1,595 x 30 m). For the 12-month period ending December 31, 2015, the airport had 9,067 general aviation aircraft operations, an average of 25 per day. In January 2017, there were 16 aircraft based at this airport: 15 single-engine and 1 multi-engine. Sault Ste. Marie Municipal Airport Sault Ste. Marie Municipal Airport , also known as Sanderson Field, is a city-owned, public-use airport located one nautical mile (1.85 km) southwest of the central business district of Sault Ste.