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
OLG Casino Sault Ste. Marie Ontario city in the form of any significant investment into any permanent structures. The casino derives some of its customers from the United States, in part because the drinking age in Ontario is 19, as opposed to 21 in Michigan. OLG Casino Sault Ste. Marie Gateway Casinos Sault Ste. Marie (formerly OLG Casino Sault Ste. Marie) is a casino in Sault Ste. Marie, Ontario. Owned an Operated by Burnaby based Gateway Casinos & Entertainment Ltd., it was Northern Ontario's first full-time casino when it opened in 1999. The casino is located near the International Bridge which links the city to