An unusually snowy winter in the northern Rockies has for now helped put the kibosh on a statewide plan to conserve Colorado River water to stop Lake Mead from falling too low. Future conservation efforts are highly uncertain. For many months, water agencies including Tucson Water have discussed a plan to save 1.2 million acre-feet of river water over three years to delay the threat of shortages to the Central Arizona Project, which brings drinking water to Tucson and Phoenix and irrigation water to Central Arizona farmers.