Opening the Gates to Greatness Some days mark quiet beginnings, and others open the floodgates—literally. June 18, 1855, was one of those latter days. On that date, the steamer Illinois became the very first vessel to pass through the Soo Locks at Sault Ste. Marie, a feat that would forever alter the course of commerce and transportation on the Great Lakes. Before the locks were built, the St. Mary’s River—connecting Lake Superior and Lake Huron—posed a serious challenge to ships due to its dangerous rapids and steep 21-foot drop. To overcome this, construction began in 1853 on two 350-foot locks… Read More »












