The dataset summarizes areas of Central Valley waterbird habitats (i.e., wetland and cropland types) that are available for each of 17 projected scenarios by planning basin, scenario, habitat, and month (August – April of the following year). The dataset also includes relatively recent (year 2005) area of habitat (i.e., “existing_km2”) for comparison with habitat areas based on scenarios. In contrast with the dataset referenced as "Table A1", which solely includes the three managed, flooded cropland habitats, cropland habitats in this dataset are defined as winter-flooded rice, unplowed dry rice, winter-flooded corn, unplowed dry corn, and other winter-flooded cropland (in Tulare basin). Wetlands are defined as summer-irrigated seasonal wetland, seasonal wetland that is not summer irrigated, and semipermanent wetland (combines semipermanent and permanent wetland types). Also in contrast with the "Table A1" dataset, these data include habitat areas for each month of August– April, and for Suisun Basin in addition to the other eight basins defined in the Central Valley Joint Venture Implementation Plan (2006). Data on availability of waterbird habitats is summarized by planning basin, scenario, habitat, and month in 5 metrics (in addition to existing area): the least available area; areas available in ≥ 25%, ≥ 50%, and ≥ 75% of years; and maximum available area. These data support the following publication: Matchett EL, Fleskes JP. 2018. Waterbird habitat in California’s Central Valley basins under climate, urbanization, and water management scenarios. Journal of Fish and Wildlife Management. Online early. doi:10.3996/122016-JFWM-095