"Montana farmer Rocky Norby has worked the land along the Missouri River for more than 20 years, coaxing sugar beets and malted barley out of the arid ground.
"Every year it gets worse," he said. "There's not enough water to get through our pumps." Last month, he said, he spent more than $10,000 trying to remove the sand from his clogged irrigation system.
The Missouri River's stream flow has changed significantly over the last 50 years, leading to serious water shortages in Montana and Wyoming and flooding in the Dakotas, according to a U.S. Geological Survey report released last month."