He Went Ice Fishing Where?

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When Jack is trying to stop Rose from jumping into the water and ending her own life, he tells her a story. In that story, he says he went ice fishing in a lake near Chippewa Falls called Lake Wissota, to warn her of how freezing the water would be. Now, this is a pretty interesting story, mostly because it doesn’t make any sense.

Lake Wissota was created in 1918 after the Chippewa River was dammed, and if you do the math – that’s six years after the Titanic sunk. So did Jack come from the future, or was he just making the story up to stop Rose from jumping?