Possible Clues:

• Jack of 'Barney Miller'
• ___ Canals
• Jack of "Barney Miller"
• Great Lakes' __ Canals
• -- Canals
• Michigan's ___ Canals
• ___ Locks (Great Lakes connectors)
• The Great Lakes' ___ Locks
• Jack of ''Barney Miller''
• Great Lakes' ___ Canals