A snowy winter and wet spring mean more of Colorado’s snowpack will make it into reservoirs across the Colorado River System.
The seven-state drought contingency plan seeks to keep two Colorado River reservoirs from dropping so low they cannot deliver water or produce hydropower.
The legislation had the support of all 14 senators representing the Colorado River basin states.
The U.S. House and Senate approved the Colorado River drought contingency plan on Monday.
Scientists are studying how much water is lost to evaporation at the nation's two largest reservoirs. There's no stopping it, but more accurate measurements could lead to better water budgeting on the Colorado River.
Colorado River basin states want congressional approval by April 22 so that Mexico also will contribute water starting in 2020.
The proposal that states have spent years negotiating got its first hearing before Congress on Wednesday.
One good year of snowpack won't reduce long-term risks on the river.
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.
Seven states have been working for years on drought contingency plans. Arizona and California have missed two deadlines.