The dramatic 24-foot rise in elevation of Devils Lake in northeastern North Dakota since 1993 has flooded both residential and agricultural areas surrounding the lake. Another 10-foot rise would result in the lake's overspill. The North Dakota State Water Commission (NDSWC) has the primary responsibility to provide effective management of North Dakota's water resources. Over the past 15 years, the NDSWC, in collaboration with the Devils Lake Basin Joint Water Resource Board, has implemented numerous flood mitigation projects for Devils Lake, costing more than $500 million, to raise levees, improve roads, and build an outlet. The rising water has destroyed hundreds of homes and businesses, inundated thousands of acres of productive farmland, and displaced nearly 1,000 people, about 15% of the population. To significantly enhance the NDSWC's long-term decision making process for managing the Devils Lake flooding, the proposed project will estimate future climate conditions in the region by combining historical data on temperature, precipitation, air humidity, and wind speed with an ensemble of Global Climate Model (GCM) projections, including the NASA GISS ModelE. The generated regional climate change data, downscaled from global data using SRTM, will be combined with current data from NASA satellites and models (e.g., TRMM/TMI, Aqua/AMSR-E, LPRM, Aqua/AIRS, GPROF, GLDAS) and input to a rainfall-runoff model and a reservoir simulation model. The many climate scenarios will allow us to explore a wide range of possible changes in temperature and precipitation and simulate low-frequency, high-impact flood events. The proposed project is an innovative practical application of NASA satellite observations to long-range climate forecasts, to address a current, major problem of water management that has enormous fi nancial and social implications. The enhancement of NDSWC's long-term decision making process by integrating NASA resources with our new approach will clearly demonstrate the societal benefits of NASA products.