May 31, 2002 — The U.S. Army Corps of Engineers is putting the finishing touches on a preliminary study of the Great Lakes-St. Lawrence Seaway system - what Corps officials call a "snapshot" of shipping on the waters. It recommends a more detailed, and more expensive, study that would consider building wider locks and deeper channels for bigger ships. Any possible construction would be years or even decades away. But seaway expansion critics are determined to stop the process in its tracks. David Sommerstein has this report.