This data set consists of 1:1,000,000-scale large springs defined as where discharge is generally greater than 1,000 gallons per minute in Utah and most of Nevada; and greater than 200 gallons per minute in more arid parts of Nevada and in California. The source of this data set is sheet 2 of a 1988 U.S. Geological Survey hydrologic investigations atlas map (Harrill and others, 1988.) Reference Cited Harrill, J.R., Gates, J.S., and Thomas, J.M., 1988, Major ground-water flow systems in the Great Basin region of Nevada, Utah, and adjacent states: U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C, scale 1:1,000,000, 2 sheets.