The river irrigates a total of , of which about 38 percent is in California and 62 percent in Nevada. Of the irrigated areas, 23 percent are in the Bridgeport Valley (California), 15 percent are in the Antelope Valley (California), 15 percent in the Smith Valley (Nevada), 44 percent in the Mason Valley (Nevada), and 2 percent on the Walker River Indian Reservation. Average annual consumptive use between 1939 and 1993 was , leaving only to flow to Walker Lake, mostly in wet years such as 1997–98.