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If you're reading a map of lake-surface levels, those numbers usually show the level of what they call "mean lower low water". That's the water level, averaged over a long period of time, of the lower of the two low tides each day. So no, it's not the lowest, but it's the average of all of the daily "lowers".

Later, when you read the tide prediction table or the fishing guide for a certain date, the numbers you see there for high- and low-tide are referenced to "mean lower low water", which I'm guessing is the number on the map.

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15y ago

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