Lake Union by the numbers

Top 5 factoids about Lake Union:

     1)  Surface area:  570 Acres

     2)  Average Depth:  33 feet

     3)  Maximum Depth:  44 feet (surprised me!)

     4)  Age:  12,000 years old

     5)  Volume:  20,000 acre-foot (see http://en.wikipedia.org/wiki/Acre-foot for definition)

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