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Irrigated agriculture in semi-arid regions such as the western United States will likely face increased volatility in access to water under climate extremes. Competing water uses including community, tribal, urban and environmental, along with higher-temperature driven increases in irrigation requirements will further the gap between available water and overall system demands. This research explores case studies in three regions of the western United States namely, the southern San Joaquin Valley in California, the Cache Valley in Utah an the Mesilla Valley in New Mexico in terms of their future ability to fulfill agricultural water demands while supporting communities and ecosystems using a web platform. The San Joaquin Valley, chronically affected for decades by groundwater overdraft and demand hardening from permanent crops and livestock wet forages, will necesitate substantial reductions in consumptive …