Is the Orleans Canal or Illinois and Michigan Canal longer?
Orleans Canal:  The current version of the canal is about 2 km long, running along the up-river side of City Park, through the Lakeview and Lakeshore neighborhood, and into Lake Pontchartrain. Illinois and Michigan Canal: The Illinois and Michigan Canal connected the Great Lakes to the Mississippi River and the Gulf of Mexico. Illinois and Michigan Canal:  In Illinois, it ran 96 mi from the Chicago River in Bridgeport, Chicago to the Illinois River at LaSalle-Peru.
Illinois and Michigan Canal