Alexandria Bay, NY, Mar 31, 2009 — Today a little before noon, a Canadian flagged freighter will slip through the locks in Montreal and usher in the 50th shipping season of the St. Lawrence Seaway. Dignitaries from the United States and Canada will be on hand to celebrate. When the Seaway was completed in 1959, a decades-old dream of connecting the Great Lakes with the Atlantic Ocean was realized. As David Sommerstein reports, the anniversary is already stoking an ongoing debate about its economic and environmental legacy.