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On December 20, 1922, a surveyor -- J.G. Tierney -- made his way along the Colorado River by barge. Tierney, who worked for the U.S. government, was surveying a remote spot in the Mojave Desert called Boulder Canyon.
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Boulder Canyon sits in the middle of some of the most unforgiving land in America.
During the summer, temperatures frequently top out near 120 degrees. Less than five inches of rain fall each year. Rattlesnakes and scorpions hide under rocks. And the sharp cliffs are near-impossible to scale.
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