GRANBY, Colo. - High in the Rocky Mountains, spring-fed streams and ponds have vanished, leaving patches of cracked mud in what were once spongy meadows. This year has been so extremely warm and arid that the mountains have remained largely snowless. The water-generating source of the Colorado River, its headwaters, is drying up. "I grew up here and have never seen the creeks and the springs dried up like they have this year," said Merrit Linke, a fourth-generation rancher and county commissioner.