Q. Why don’t the Great Lakes have tides? (via Quora)
A. They do! All bodies of water have tides — even your bathtub! Even your coffee cup!
But here’s the catch: You need an ocean-sized amount of water for the cumulative effect of tides to be easily visible.
In fact, the very largest tides on the Great Lakes only change the water level by about five centimeters, or less than 2″; an amount easily masked by other effects such as wind and rainfall. (Source)
So, the tides are there, but are too small to notice.
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