** AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** SUSTAINABLE WATER AVAILABILITY IS CENTRAL TO THE LONG-TERM HEALTH, VIABILITY, AND FUNCTIONING OF IRRIGATED AGROECOSYSTEMS. CHARACTERIZATION OF FUTURE WATER AVAILABILITY IN THESE SYSTEMS CURRENTLY FOCUSES ON CHANGES TO WATER SUPPLY AND WATER DEMAND FOR CROP EVAPOTRANSPIRATION. CHANGES TO AGRICULTURAL WATER DEMAND ASSOCIATED WITH MANAGING INCREASINGLY EXTREME TEMPERATURES (E.G. VIA EVAPORATIVE COOLING) ARE NOT CURRENTLY ACCOUNTED FOR, BUT CAN BE QUITE LARGE, ESPECIALLY FOR PERENNIAL CROPPING SYSTEMS. THIS INCREASED DEMAND CHALLENGES THE SUSTAINABILITY OF BOTH AGRICULTURE (OUT-OF-STREAM WITHDRAWALS) AND THE ENVIRONMENT (INSTREAM FLOWS), ESPECIALLY FOR WATER-STRESSED REGIONS. CONTINUED IGNORANCE OF THIS ASPECT RAISES THE RISK THAT IRRIGATED AGROECOSYSTEMS ARE UNDER-PREPARED TO ADAPT TO CHANGING WATER AVAILABILITY. OUR OVERARCHING GOAL IS TO ADVANCE THE STATE-OF-THE-ART OF CLIMATE CHANGE IMPACT ASSESSMENTS BY BUILDING CAPACITY TO INTEGRATE THE IMPORTANT BUT CURRENTLY NEGLECTED AGRICULTURAL WATER NEEDS FOR EXTREME-TEMPERATURE-MANAGEMENT INTO THE REGIONAL PLANNING AND DECISION-MAKING EFFORTS OF A DIVERSE RANGE OF STAKEHOLDERS. USING IRRIGATED WATERSHEDS IN THE COLUMBIA RIVER BASIN AS A CASE STUDY, WE PROPOSE TO DEVELOP AND APPLY AN INTEGRATED MODELING FRAMEWORK TO COMPREHENSIVELY CHARACTERIZE (I) THE FUTURE REGIONAL AGRICULTURAL WATER DEMANDS INCLUDING THE DEMANDS FOR EXTREME-TEMPERATURE-MANAGEMENT (II) THE IMPACTS OF THIS ADDITIONAL DEMAND ON AGRICULTURAL AND ENVIRONMENTAL WATER AVAILABILITY AND SHORTAGES, AND (III) OPPORTUNITIES TO ADDRESS THIS ADDITIONAL DEMAND AND ASSOCIATED IMPACTS AND EXPLORE WIN-WIN OUTCOMES FOR BOTH CROP PRODUCTION AND ENVIRONMENTAL FLOWS. THIS WORK WILL ENHANCE OUR ABILITY TO IDENTIFY ADAPTATION ALTERNATIVES TO A CHANGING CLIMATE THAT ENSURE NUTRITIONAL SECURITY AND HEALTHY AGRICULTURAL ECONOMIES WHILE PROTECTING INSTREAM FLOWS, THUS ENHANCING AGROECOSYSTEM SUSTAINABILITY.