On This Date in Minnesota History: June 26

June 26, 1959 – The “St. Lawrence Seaway, after a 40-year struggle, [was] officially opened by Queen Elizabeth II and President Eisenhower. In the Guinness Book of World Records: The St. Lawrence Seaway is the world's longest artificial seaway. It enables ocean going vessels to sail the 2,342 miles from the North Atlantic to Duluth, Minn. (602 feet above sea level.)”
http://www.thehistorypeople.com/data/docs/timeline-part2.pdf

http://www.encyclopedia.com/topic/Saint_Lawrence_Seaway.aspx