Jim Dreyer is hauling two dinghies filled with 334 bricks weighing a total of more than 2,000 pounds.
An online tracker showed him roughly half done early Tuesday morning.
He began Monday morning and plans to end Tuesday afternoon at Detroit's Belle Isle.
One dinghy is equipped with a radar target so Dreyer will show up on radar screens. He has to feed himself and doesn't plan to leave the water until coming ashore in Detroit.
Dreyer has made direct crossings of the five Great Lakes. He's trying to raise money and awareness for Habitat for Humanity.
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