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In this June 10, 2005 an ore ship passes through the Soo Locks in Sault Ste. Marie, Mich. Vessels large and small pass through the structures known as the Soo Locks more than 7,000 times a year. Officials from the Great Lakes states are making renewed push to win approval of a long-stalled proposal for adding a new lock to the Soo Locks complex, a critical chokepoint that connects Lake Superior to the lower Great Lakes. Only one of the two working locks there handles large iron ore boats. (AP Photo/John Flesher)

In this June 10, 2005 an ore ship passes through the Soo Locks in Sault Ste. Marie, Mich. Vessels large and small pass through the structures known as the Soo Locks more than 7,000 times a year. Officials from the Great Lakes states are making renewed push to win approval of a long-stalled proposal for adding a new lock to the Soo Locks complex, a critical chokepoint that connects Lake Superior to the lower Great Lakes. Only one of the two working locks there handles large iron ore boats. (AP Photo/John Flesher)

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