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I believe the largest in North America is Lake Powell at 126 mi long in Arizona. It was created when the Glen Canyon Dam was built on the Colorado River. As for the next nine...? Lake Powell is actually the 2nd largest. The sizes of artificial lakes is measured by volume, and in the United States this is typically measured in acre-feet. The values reported here are for the "normal" volume for which the lake was designed. Of course, variations in climate will cause lakes to fluctuate over time, sometimes being larger or smaller than reported here. 1. Lake Mead (Arizona and Nevada) — 28.5 million acre-feet in volume 2. Lake Powell (Arizona and Utah) — 24.3 million acre-feet in volume 3. Lake Sakakawea (North Dakota) — 23.8 million acre-feet in volume 4. Lake Oahe (South Dakota) — 23.5 million acre-feet in volume 5. Fort Peck Lake (Montana) — 17.9 million acre-feet in volume (An acre-foot is the amount of water required to cover one acre of ground to a depth of one foot. It is 325,851 gallons, or 1,233,500 liters.)

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16y ago

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