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Originally Posted by deja vu
Interesting. Is its designation as largest based on surface area alone, or volume of water?
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My guess would be surface area, since volume of water is nil for about half the year.
Lake Mead and Lake Powell are man-made offshoots of the Colorado River (Hoover and Glen Canyon dams), and down south, Roosevelt and Canyon lakes are man-made retention basins constructed after Roosevelt Dam was built, if I remember correctly?