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John Wesley Powell was a U.S. soldier, geologist, explorer of the American West, and director of major scientific and cultural institutions. He is famous for the 1869 Powell Geographic Expedition, a three-month river trip down the Green and Colorado rivers that included the first passage of European Americans through the Grand Canyon. Powell served as second director of the US Geological Survey (1881-1894), and was also the director of the Bureau...
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In 1902 the passage of the Reclamation Act and its mandate for the federal government to build dams for irrigation in the West created a need for accurate topographical surveys and geological studies of the rivers where the dams would be built. By 1920 the U.S. Geological Survey (USGS) and other agencies had surveyed the easily accessible stretches of the Colorado River and its main tributaries. The remaining segments had yet to be charted because...
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