This report outlines concerns for climate change impacts as they will effect California with possible sea level rise, shifting mountain runoff from Spring to Winter, changes in precipitation and runoff volume, drought, high stream and reservoir temperatures, increased water demands, and increased flood flows and frequencies. Options and costs for adaptations to climate change are outlined for water supply, flood management, hydro-power, and water quality. Institutional capacities and constraints to adaptation in water supply management, flood management, and water quality management are described and addressed with methods to improve adaptation capacities.