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, Michigan snow a year, with a record year when fell. of snow fell in one five-day snowstorm, including in 24 hours, in December 1995. Over the winter of 2015, Sault Ste. Marie received 158.7 inches of snow, ranking it the most snowfall measured in the nation that year. Sault Ste. Marie receives an average annual of precipitation measured as equivalent rainfall. Its immediate region is also the cloudiest in Michigan's Upper Peninsula, having over 200 cloudy days a year. Temperatures in Sault Ste. Marie have varied between a record low of and a record high of . Monthly average temperatures range