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Irrigated acres by crop type and year:
Source: United States Department of Agriculture's Census of Agriculture. *Note: The category "Forage" is a summary category, and is not included in the total.
Source: US Bureau of Reclation and The Nature Conservancy, Consumptive Uses & Losses (CUL) Irrigation and Crop Type, from the report "Demonstration Mapping for Increasing Agricultural Water Security across the Colorado River Basin."
Source: USDA and The Nature Conservancy, Cropland Data Layer, does not differentiate irrigated vs. rainfed crops