Colorado River basin states want congressional approval by April 22 so that Mexico also will contribute water starting in 2020.
The U.S. Drought Monitor reported Thursday that more than 50 percent of the state is not under any drought conditions -- last week it was only 17 percent.
One good year of snowpack won't reduce long-term risks on the river.
Stopping future blowouts from mine shafts is the toughest of the three goals.
The U.S. Bureau of Reclamation has given governors or their representatives in the seven states until March 19 to recommend the next steps after California and Arizona failed to meet its deadlines.
The Imperial Irrigation District is the largest single recipient of Colorado River water, with 3.1 million-acre feet of California’s 4.4 million-acre entitlement under legal compacts stretching back nearly a century.
Many mines pose the chronic problem of relentless pollution.
The drought plan requires Arizona to find a way to reduce its use of Colorado River water by up to 700,000 acre-feet — more than twice Nevada's yearly allocation under the drought plan.
The other six states in the Colorado River basin have agreed to plans that recognize a long-running drought, the dwindling supply of water and how they intend to cope with it.