Tides have a lot to do with it, winds too. Downbound loaded lakers coming off of Lake Superior have been known to wait west of the Soo locks for a strong westerly wind. raises the lake level enough so they don't scrape going through the locks. The tide can be a 2-3 foot change in the course of one day, at least it was on both the bays I lived by (Gulf of Corinth and Tampa Bay) And as another poster explained the Panama canal is there to raise or lower the ships to the level of the lake they cross inland and then back to sea level.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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