FILE - This March 5, 2008 file photo shows the Colorado River's Horseshoe Bend, in Page, Ariz. Rising demand and falling supply is spurring talk in the arid West of outside-the-box

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FILE - This March 5, 2008 file photo shows the Colorado River's Horseshoe Bend, in Page, Ariz. Rising demand and falling supply is spurring talk in the arid West of outside-the-box solutions like piping water from the nation's heartland and towing Arctic icebergs south to help thirsty U.S. cities like Denver, Los Angeles, Las Vegas and Phoenix that are currently dependent on the Colorado River. Faced with ongoing drought, federal officials and water agency representatives from seven states and 40 million people that depend on the Colorado River have produced a report to be released at a three-day Colorado River Water Users Association conference in Las Vegas. (AP Photo/Matt York, File) less