article_snippet: Seven states and 40million people get water from different parts of The river's basin, which extends into the southern reaches of Wyoming.
article_snippet: Around 40million people get water from different parts of the Colorado River basin, and Lake Powell (pictured) used to be one-fourth the size of Rhode Island .
article_snippet: The Colorado River basin stretches from the southern reaches of Wyoming to southwestern states such as Arizona (pictured)
article_snippet: pebbles from the riverbed are exposed .
article_snippet: The diminishing of Colorado River has exposed vegetation from the riverbed, such as that on this section around Horseshoe Bend .
article_snippet: Motorboats can still navigate on some stretches of Colorado River, though paddle boats are necessary for other parts .
article_snippet: Above, boaters tour the Cathedral in the Desert formations in 2007 .