The Sierra's are in California, and not generally considered "in Nevada" ... certainly the westside of the crest of the Sierra feeds only California ... Nevada's climate is considered either "arid" or "semi-arid" with Mediterranean influence ... and we could divide this area up into a "hot" southern portion and a "mild" northern portion that extends up into Eastern Oregon and the Columbia Plateau ...
Yeah ... pay-wall ... dope ... here's the State's take on this matter
"Agriculture in Nevada" ... as I thought, this is mostly ranging cattle ... as irrigation allows, they can grow alfalfa for export ...
The sad truth is that this land isn't good for anything else besides cattle ... and ranchers lease these lands for dollars per square mile just to make a living ... go onto Google Earth and scan around ... it's really really easy to see where there's water in Nevada ...
Population is Lake Meade's problem ... not agriculture ...