A Pair of Ships Refuelling

 There are two fuel docks near Detroit.  Ships will typically stop at them on their upbound journey.

This is the Sterling in Windsor.  It is typically used by Canadian (or Canadian flagged) ships.  The Kaminisiqua was pulling into the docks as I was down there.

This is the Maumee.  She is the barge portion of a tug/barge.  She was docked at the Mistersky Fuel Docks.  I think she pulled in after the American Century left.