What is the primary manmade connection linking the Great Lakes Basin and the Mississippi River watershed?

Answer

Chicago Area Waterway System (CAWS)

The Chicago Area Waterway System (CAWS), a series of artificial canals and rivers, provides the most likely corridor allowing the northward migration of Asian carp by artificially linking the two major watersheds.

What is the primary manmade connection linking the Great Lakes Basin and the Mississippi River watershed?
fishwaterlakeinvasionCarp