Water levels are so low on the Colorado River that Lake Mead, the huge reservoir created by Hoover Dam, is at a 40-year low. Marinas are having to move long distances to find deep water for their boat slips.
A new report from the National Research Council says it's likely to get worse. The report's authors concluded that climate change likely will further reduce the river's flow and water supplies.
Farms and homeowners in much of the West rely on Colorado River water. The report's authors say the region needs to rethink how it divvies up the water from the river.