The construction of the St. Lawrence Seaway opened up the vast area of the Great Lakes to overseas freighters but it also provided easy access for invasive species. The destruction they have caused is catastrophic. Dan Egan believes ships from beyond North America should not be allowed to go through the locks. He makes the case in his new book, “The Death and Life of the Great Lakes.” Click on the following paragraph to access the full story.
Dan Egan calls the St. Lawrence Seaway “the front door” to the Great Lakes and he can’t believe we’ve been leaving it wide open. For years when ships went through the system of locks along the St. Lawrence River they carried with them ballast water from their point of origin. When they picked up cargo further up the Great Lakes system, that ballast water was drained. This is probably how zebra mussels and quagga mussels found their way from the Caspian Sea into the very hospitable environment of the Great Lakes and the St. Lawrence River.