Arizona farms are first in line to bear the brunt of the biggest restrictions put in place on the use of the Colorado River’s water after officials declared an unprecedented shortage last week.

Lake Mead reached its lowest water level since the 1930s in July, and low levels are projected to continue into 2023, prompting officials at the Bureau of Reclamation to drastically reduce Arizona’s consumption of the river’s water. Last year, the river’s already low levels resulted in Arizona getting 512,000 acre-feet less water in 2022. Even drier conditions this year led to a cut of 592,000 acre-feet in 2023, or 21% of its annually allocated Colorado River water. Nevada and Mexico are also subject to the restrictions, reducing their supply by 8% and 7%, respectively. California, the river’s largest user, isn’t subject to the restrictions.