LAS VEGAS — The water managers responsible for divvying up the Colorado River’s dwindling supply are painting a bleak portrait of a river in crisis, warning that unprecedented shortages could be coming to farms and cities in the West and that old rules governing how water is shared will have to change.
State and federal authorities say that years of overconsumption are colliding with the stark realities of climate change, pushing Colorado River reservoirs to such dangerously low levels that the major dams on the river could soon become obstacles to delivering water to millions in the Southwest...