Change in irrigated cropland is displayed on an 8-digit hydrologic unit basis. Substantial change is defined for the purposes of this map as a net gain or loss of 20,000 or more acres of irrigated cropland. Areas of net gain or loss less than 20,000 acres are not shown. When provided, refer to the estimated margins of error to determine suitability of the data for a particular purpose. NRI maps reflect national patterns rather than site-specific information.
Water is supplied to crops by ditches, pipes, or other conduits.
For additional information contact the Resource Assessment Division. Please include the Product ID you are inquiring about. If you use our analysis products, please be aware of our disclaimer .