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http://www.lre.usace.army.mil/Missions/Recreation/SooLocksVisitorCenter/SooLocksHistory.aspxBefore the locks the boats would have to get out of the water put on rollers and rolled down what we npw know as portage (Main) St.
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http://www.lre.usace.army.mil/Missions/Recreation/SooLocksVisitorCenter/SooLocksHistory.aspxhttp://www.lre.usace.army.mil/Missions/Recreation/SooLocksVisitorCenter/SooLocksHistory.aspxDuring the building of the locks, a lot of people were paid to work on the locks to help get it done as soon as possible. The project designer was Charles Harvey.
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http://www.lre.usace.army.mil/Missions/Recreation/SooLocksVisitorCenter/SooLocksHistory.aspxFirst lock opens, operated by the State of Michigan.
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http://www.lre.usace.army.mil/Missions/Recreation/SooLocksVisitorCenter/SooLocksHistory.aspxFirst lock in the world to fill and empty from the bottom.
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http://www.lre.usace.army.mil/Missions/Recreation/SooLocksVisitorCenter/SooLocksHistory.aspxThird and fourth locks both open by 1919.
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http://www.lre.usace.army.mil/Missions/Recreation/SooLocksVisitorCenter/SooLocksHistory.aspxCarl D. Bradley opens the MacArthur Lock.
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http://www.lre.usace.army.mil/Missions/Recreation/SooLocksVisitorCenter/SooLocksHistory.aspxhttp://www.lre.usace.army.mil/Missions/Recreation/SooLocksVisitorCenter/SooLocksHistory.aspxhttp://www.lre.usace.army.mil/Missions/Recreation/SooLocksVisitorCenter/SooLocksHistory.aspx Vessel sizes continued to increase and began to push the limits of even the MacArthur Lock by the 1950s. To meet the growing demand for larger and larger vessels, planning began in 1958 for a larger and deeper lock to replace the 60+ year old Poe Lock.
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http://www.lre.usace.army.mil/Missions/Recreation/SooLocksVisitorCenter/SooLocksHistory.aspxmain cardo is iron ore, and coal the boats carried nearly 80 million tons.
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http://www.lre.usace.army.mil/Missions/Recreation/SooLocksVisitorCenter/SooLocksHistory.aspxIt takes freighters about 7-8 hoursFrom the mackinac bridge.
From Detroit or Chicago to the locks is about 24 hours. From Duluth to the locks is about 28 hours