A profile of the last tugboats on Lake Superior
August 6, 1996 - Mainstreet Radio's Catherine Winter visits the last remaining tugboat company in the Duluth Superior harbor. For more than 150 years, big ships have sailed the Great Lakes, from state to state and out to the sea. For nearly as long, little tugboats have helped the great freighters in and out of harbors, broken ice for them in winter, and rescued boats in emergencies.